diff --git a/inbound_verify/expected_undelivered.py b/inbound_verify/expected_undelivered.py
index 1b9fc2f..b23e9c6 100644
--- a/inbound_verify/expected_undelivered.py
+++ b/inbound_verify/expected_undelivered.py
@@ -40,7 +40,9 @@ from openpyxl.chart import BarChart, Reference
 from openpyxl.worksheet.page import PageMargins
 from openpyxl.worksheet.properties import PageSetupProperties
 
-BASE = os.path.dirname(os.path.abspath(__file__))
+# 包内文件：上两级 = 项目根（与 paths.BASE_DIR 一致；站点下载落在 <root>/downloads）。
+# 注：本模块自带锚点是 paths.py 的重复，Tier 2 计划改为直接引用 paths.DOWNLOAD_DIR/OUTPUT_DIR。
+BASE = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 DOWNLOADS = os.path.join(BASE, "downloads")
 OUTPUT = os.path.join(BASE, "output")
 OUTFILE = os.path.join(OUTPUT, "应到未到数据.xlsx")