diff --git a/scripts/admin-test-env-modules/phase3-loading.mjs b/scripts/admin-test-env-modules/phase3-loading.mjs
index 8f6211677..10fd5475b 100644
--- a/scripts/admin-test-env-modules/phase3-loading.mjs
+++ b/scripts/admin-test-env-modules/phase3-loading.mjs
@@ -47,17 +47,19 @@ async function ensureMatsonSupplier(context, records) {
   return supplierId ? { id: supplierId, name: MATSON_SUPPLIER_NAME, status: 'ACTIVE' } : null
 }
 
-export function stableLoadedCartonMarks(items, loadingPlanId) {
+export function stableLoadedCartonMarks(items) {
   const used = new Set()
   return [...(Array.isArray(items) ? items : [])]
     .sort((left, right) => id(left?.loadingPlanItemId).localeCompare(id(right?.loadingPlanItemId)))
     .flatMap((item) => {
       const count = Math.max(0, Number(item?.pickedPackageCount) || 0)
-      const seed = `${loadingPlanId}:${id(item?.loadingPlanItemId)}`
       const labels = [...new Set((item?.boxCodes || [])
         .map((value) => String(value || '').trim()).filter((value) => value && !used.has(value)))]
-        .sort((left, right) => createHash('sha256').update(`${seed}:${left}`).digest('hex')
-          .localeCompare(createHash('sha256').update(`${seed}:${right}`).digest('hex')))
+        // Partial loading keeps the lowest carton indexes on the loaded source inbound and
+        // transfers the highest indexes to the remainder child. Mirror that settlement rule
+        // instead of sampling labels, otherwise downstream PDA fixtures may reference cartons
+        // that were deliberately moved out of this container.
+        .sort((left, right) => left.localeCompare(right, undefined, { numeric: true, sensitivity: 'base' }))
         .slice(0, count)
       labels.forEach((value) => used.add(value))
       return labels
@@ -1477,7 +1479,7 @@ export async function run(context) {
   context.createdResources.phase3Loading = {
     tenantId, orderId: id(source?.orderId), inboundId, preloadPlanId: planId,
     cartonMark: source?.boxCode || source?.cartonMark || null,
-    cartonMarks: stableLoadedCartonMarks(stagedTask?.items, loadingPlanId),
+    cartonMarks: stableLoadedCartonMarks(stagedTask?.items),
     fulfillmentType: source?.fulfillmentType || 'STANDARD',
     skuCodes: [...new Set([...(Array.isArray(source?.skuCodes) ? source.skuCodes : []),
       ...(Array.isArray(incrementalFixture?.skuCodes) ? incrementalFixture.skuCodes : [])])],
diff --git a/scripts/admin-test-env-modules/phase3-producer-chain-contract.test.mjs b/scripts/admin-test-env-modules/phase3-producer-chain-contract.test.mjs
index d5b1bbbda..14226516e 100644
--- a/scripts/admin-test-env-modules/phase3-producer-chain-contract.test.mjs
+++ b/scripts/admin-test-env-modules/phase3-producer-chain-contract.test.mjs
@@ -4,6 +4,7 @@ import test from 'node:test'
 
 import { selectCustomsFlow } from './phase3-customs.mjs'
 import { buildFinalizeResource } from './phase3-loading-finalize.mjs'
+import { stableLoadedCartonMarks } from './phase3-loading.mjs'
 import { selectContainerLoadingFixture, selectPlatformChannelIsolationPair } from './phase3-container-loading.mjs'
 import { diffPushPreloadStability, projectPushPreloadStability } from './push-preload-stability.mjs'
 import { AcceptanceRun, normalizeModuleOrder, parseArguments } from '../admin-test-env-acceptance.mjs'
@@ -440,11 +441,24 @@ test('preload and loading versions use immediate operation baselines and exact p
   assert.match(loading, /shippingCompanyId: id\(shippingCarrier\.id\), shippingCompanyName: shippingCarrier\.name/)
   assert.match(loading, /bookingAgentId: id\(supplier\.id\), bookingAgentName: supplier\.name/)
   assert.doesNotMatch(loading, /shippingCompanyId: id\(supplier\.id\), shippingCompanyName: supplier\.name/)
-  assert.match(loading, /cartonMarks: stableLoadedCartonMarks\(stagedTask\?\.items, loadingPlanId\)/)
-  assert.match(loading, /createHash\('sha256'\)\.update\(`\$\{seed\}:\$\{left\}`\)/)
+  assert.match(loading, /cartonMarks: stableLoadedCartonMarks\(stagedTask\?\.items\)/)
   assert.match(source('./phase3-loading-finalize.mjs'), /cartonMarks: Array\.isArray\(fixture\.cartonMarks\)/)
 })
 
+test('loaded carton fixture mirrors partial settlement and keeps the lowest carton indexes', () => {
+  const marks = stableLoadedCartonMarks([
+    { loadingPlanItemId: '20', pickedPackageCount: 3,
+      boxCodes: ['NYEXX2609020358#8-5', 'NYEXX2609020358#8-2', 'NYEXX2609020358#8-1', 'NYEXX2609020358#8-3'] },
+    { loadingPlanItemId: '10', pickedPackageCount: 1, boxCodes: ['NYEXX2609020357#4-4', 'NYEXX2609020357#4-1'] },
+  ])
+  assert.deepEqual(marks, [
+    'NYEXX2609020357#4-1',
+    'NYEXX2609020358#8-1',
+    'NYEXX2609020358#8-2',
+    'NYEXX2609020358#8-3',
+  ])
+})
+
 test('PDA completion acceptance verifies immutable BATCH and COMPLETE_LOADING audit with operator metadata', () => {
   const loading = source('./phase3-loading.mjs')
   const container = source('./phase3-container-loading.mjs')