diff --git a/src/modules/first-leg/api/unifiedOrders.test.mjs b/src/modules/first-leg/api/unifiedOrders.test.mjs
index 9e1ee43..2863941 100644
--- a/src/modules/first-leg/api/unifiedOrders.test.mjs
+++ b/src/modules/first-leg/api/unifiedOrders.test.mjs
@@ -1,9 +1,28 @@
 import assert from 'node:assert/strict'
 import { readFileSync } from 'node:fs'
 import test from 'node:test'
+import ts from 'typescript'
 
 const source = readFileSync(new URL('./unifiedOrders.ts', import.meta.url), 'utf8')
 
+test('forwards optional tax mode and pagination through the current GET endpoint', async () => {
+  const calls = []
+  const code = ts.transpileModule(source, { compilerOptions: { module: ts.ModuleKind.CommonJS } }).outputText
+  const api = {}
+  new Function('require', 'exports', code)(id => {
+    assert.equal(id, '@/api/http')
+    return { apiRequest: async config => { calls.push(config); return { records: [] } } }
+  }, api)
+  await api.getMerchantUnifiedOrders({ page: 2, size: 200, taxMode: 'TAX_REFUND' })
+  await api.getMerchantUnifiedOrders({ taxMode: 'BUY_DECLARATION' })
+  await api.getMerchantUnifiedOrders()
+  assert.deepEqual(calls, [
+    { method: 'GET', url: '/merchant/v1/orders', params: { page: 2, size: 200, taxMode: 'TAX_REFUND' } },
+    { method: 'GET', url: '/merchant/v1/orders', params: { page: 1, size: 200, taxMode: 'BUY_DECLARATION' } },
+    { method: 'GET', url: '/merchant/v1/orders', params: { page: 1, size: 200 } },
+  ])
+})
+
 test('keeps the merchant unified-order boundary and one-click palletization status', () => {
   assert.match(source, /const unifiedOrderBaseUrl = '\/merchant\/v1\/orders'/)
   assert.match(source, /ApiUnifiedOrderMainStatus[\s\S]*?'WAIT_PALLETIZE'/)
diff --git a/src/modules/first-leg/api/unifiedOrders.ts b/src/modules/first-leg/api/unifiedOrders.ts
index 07464d0..a49ead1 100644
--- a/src/modules/first-leg/api/unifiedOrders.ts
+++ b/src/modules/first-leg/api/unifiedOrders.ts
@@ -141,6 +141,7 @@ export interface MerchantUnifiedOrderDetail {
 }
 
 export interface MerchantUnifiedOrderQuery {
+  taxMode?: ApiTaxMode
   keyword?: string
   fbaCode?: string
   orderNo?: string
diff --git a/src/modules/first-leg/utils/customsDocumentsReader.ts b/src/modules/first-leg/utils/customsDocumentsReader.ts
index 8e77b83..13bd447 100644
--- a/src/modules/first-leg/utils/customsDocumentsReader.ts
+++ b/src/modules/first-leg/utils/customsDocumentsReader.ts
@@ -16,7 +16,7 @@ export async function readCustomsDocuments() {
   let failedCount = 0
   const size = 200
   for (let page = 1; ; page += 1) {
-    const response = await getMerchantUnifiedOrders({ page, size })
+    const response = await getMerchantUnifiedOrders({ page, size, taxMode: 'TAX_REFUND' })
     const total = Number(response.total)
     const pages = Number(response.pages)
     if (!Number.isSafeInteger(total) || total < 0 || Number(response.page) !== page
diff --git a/src/modules/first-leg/views/CustomsDocumentsView.test.mjs b/src/modules/first-leg/views/CustomsDocumentsView.test.mjs
index 4f62422..2e9c295 100644
--- a/src/modules/first-leg/views/CustomsDocumentsView.test.mjs
+++ b/src/modules/first-leg/views/CustomsDocumentsView.test.mjs
@@ -18,14 +18,22 @@ const order = (id, status = 'LOADED', taxMode = 'TAX_REFUND') => ({ id, status,
 const detail = id => ({ status: 'COMPLETED', merchantStatus: 'CUSTOMS_COMPLETED', inbounds: [{ orderId: id, taxMode: 'TAX_REFUND' }] })
 function harness(t, orders, getDetail = async id => detail(id)) {
   const store = { loadError: '', failPage: 0, transformPage: value => value }, calls = [], pageCalls = []
+  const unifiedApi = evaluate(readFileSync(new URL('../api/unifiedOrders.ts', import.meta.url), 'utf8'), {
+    '@/api/http': { apiRequest: async ({ method, url, params: { page, size, taxMode } }) => {
+      assert.equal(method, 'GET')
+      assert.equal(url, '/merchant/v1/orders')
+      pageCalls.push({ page, size, taxMode })
+      if (store.loadError || store.failPage === page) throw new Error(store.loadError || '第二页订单查询失败')
+      // Model server filtering BEFORE pagination and COUNT, using the actual
+      // request produced by the production API. Missing taxMode scans all rows.
+      const filtered = taxMode ? orders.filter(row => row.taxMode === taxMode) : orders
+      return store.transformPage({ page, size, total: filtered.length, pages: Math.ceil(filtered.length / size),
+        records: filtered.slice((page - 1) * size, page * size).map(row => ({ orderId: row.id, orderNo: row.orderNo, mainStatus: row.status, taxMode: row.taxMode, inboundCode: row.businessSummary.inboundCode })) })
+    } },
+  })
   const reader = evaluate(readFileSync(new URL('../utils/customsDocumentsReader.ts', import.meta.url), 'utf8'), {
     './customsEligibility': eligibility,
-    '../api/unifiedOrders': { getMerchantUnifiedOrders: async ({ page, size }) => {
-      pageCalls.push({ page, size })
-      if (store.loadError || store.failPage === page) throw new Error(store.loadError || '第二页订单查询失败')
-      return store.transformPage({ page, size, total: orders.length, pages: Math.ceil(orders.length / size),
-        records: orders.slice((page - 1) * size, page * size).map(row => ({ orderId: row.id, orderNo: row.orderNo, mainStatus: row.status, taxMode: row.taxMode, inboundCode: row.businessSummary.inboundCode })) })
-    } },
+    '../api/unifiedOrders': unifiedApi,
     '../api/customs': { getMerchantCustomsForOrder: id => { calls.push(id); return getDetail(id) }, isMerchantCustomsUnavailable: error => error?.code === 'A0404' },
   })
   const source = readFileSync(new URL('./CustomsDocumentsView.vue', import.meta.url), 'utf8').match(/<script setup lang="ts">([\s\S]*?)<\/script>/)[1]
@@ -38,14 +46,20 @@ function harness(t, orders, getDetail = async id => detail(id)) {
   return { view, store, calls, pageCalls }
 }
 
-test('finds historical refund documents beyond the first 200 unified orders', async t => {
-  const orders = Array.from({ length: 200 }, (_, i) => order(`buy-${i}`, 'COMPLETED', 'BUY_DECLARATION'))
-  orders.push(order('historical', 'COMPLETED'))
+test('server-filtered request reaches five refund records originally on page 28 without scanning buy orders', async t => {
+  const orders = Array.from({ length: 5528 }, (_, i) => order(`buy-${i}`, 'COMPLETED', 'BUY_DECLARATION'))
+  orders.push(...Array.from({ length: 5 }, (_, i) => order(`historical-${i}`, 'COMPLETED')))
   const { view, calls, pageCalls } = harness(t, orders)
   await view.load()
-  assert.deepEqual(calls, ['historical'])
-  assert.equal(view.records.value[0].order.id, 'historical')
-  assert.deepEqual(pageCalls, [{ page: 1, size: 200 }, { page: 2, size: 200 }])
+  assert.deepEqual(calls, Array.from({ length: 5 }, (_, i) => `historical-${i}`))
+  assert.equal(view.records.value.length, 5)
+  assert.deepEqual(pageCalls, [{ page: 1, size: 200, taxMode: 'TAX_REFUND' }])
+  view.queryModel.value.inboundCode = 'historical-4'; view.search()
+  assert.equal(view.filteredRecords.value.length, 1)
+  view.queryModel.value = { orderNo: '', inboundCode: '', containerNo: '', status: '' }; view.search()
+  assert.equal(view.filteredRecords.value.length, 5)
+  assert.equal(pageCalls.length, 1)
+  assert.equal(calls.length, 5)
 })
 
 test('second page failure is explicit and retry does not retain an incomplete result', async t => {
@@ -68,7 +82,7 @@ test('empty pages, duplicate records and changing totals cannot silently truncat
     response => response.page === 2 ? { ...response, records: [{ ...response.records[0], orderId: '0' }] } : response,
     response => response.page === 2 ? { ...response, total: 202 } : response,
   ]) {
-    const { view, store, pageCalls } = harness(t, Array.from({ length: 201 }, (_, i) => order(String(i), 'COMPLETED', 'BUY_DECLARATION')))
+    const { view, store, pageCalls } = harness(t, Array.from({ length: 201 }, (_, i) => order(String(i), 'COMPLETED')))
     store.transformPage = change
     await view.load()
     assert.ok(view.errorMessage.value)
@@ -90,6 +104,7 @@ test('document fetch concurrency never exceeds four and each candidate is reques
   assert.equal(new Set(calls).size, 205)
   assert.equal(calls.length, 205)
   assert.equal(pageCalls.length, 2)
+  assert.deepEqual(pageCalls, [{ page: 1, size: 200, taxMode: 'TAX_REFUND' }, { page: 2, size: 200, taxMode: 'TAX_REFUND' }])
   assert.equal(view.records.value.length, 205)
 })