diff --git a/backend/tests/test_sprint227_statbel_population_preflight.py b/backend/tests/test_sprint227_statbel_population_preflight.py
index 37cc5251..6ad625cb 100644
--- a/backend/tests/test_sprint227_statbel_population_preflight.py
+++ b/backend/tests/test_sprint227_statbel_population_preflight.py
@@ -107,6 +107,7 @@ def geometry_archive(
     date: str = "2025-01-01",
     municipality_mismatch: bool = False,
     repairable_invalid: bool = False,
+    include_crs_token_in_member: bool = True,
 ) -> bytes:
     payload = {
         "type": "FeatureCollection",
@@ -133,10 +134,14 @@ def geometry_archive(
         }
         payload["features"][0]["properties"]["ms_area_ha"] = 2.0
     buffer = io.BytesIO()
+    member_stem = (
+        "sh_statbel_statistical_sectors_31370_20250101"
+        if include_crs_token_in_member
+        else "sh_statbel_statistical_sectors_20250101"
+    )
     with zipfile.ZipFile(buffer, "w", compression=zipfile.ZIP_DEFLATED) as archive:
         archive.writestr(
-            "sh_statbel_statistical_sectors_31370_20250101.geojson/"
-            "sh_statbel_statistical_sectors_31370_20250101.geojson",
+            f"{member_stem}.geojson/{member_stem}.geojson",
             json.dumps(payload),
         )
     return buffer.getvalue()
@@ -225,6 +230,18 @@ def test_preflight_supports_the_complete_national_scope() -> None:
     assert accounting["accounted_population_total"] == 243
 
 
+def test_preflight_accepts_real_archive_member_without_repeated_crs_token(tmp_path: Path) -> None:
+    result = validate(
+        tmp_path,
+        geometry_content=geometry_archive(include_crs_token_in_member=False),
+    )
+
+    assert result.manifest["status"] == "passed"
+    assert result.manifest["artifacts"]["geometry"]["member"].endswith(
+        "/sh_statbel_statistical_sectors_20250101.geojson"
+    )
+
+
 def test_national_preflight_rejects_an_unscoped_baseline(tmp_path: Path) -> None:
     with pytest.raises(PREFLIGHT.StatbelPreflightError) as exc_info:
         PREFLIGHT.validate_statbel_release(
diff --git a/scripts/statbel_population_preflight.py b/scripts/statbel_population_preflight.py
index 0c978ceb..97174bcb 100644
--- a/scripts/statbel_population_preflight.py
+++ b/scripts/statbel_population_preflight.py
@@ -56,7 +56,7 @@ POPULATION_MEMBER_PATTERN = re.compile(
     re.IGNORECASE,
 )
 GEOMETRY_MEMBER_PATTERN = re.compile(
-    r"^sh_statbel_statistical_sectors_31370_(20[0-9]{2})0101\.geojson$",
+    r"^sh_statbel_statistical_sectors_(?:31370_)?(20[0-9]{2})0101\.geojson$",
     re.IGNORECASE,
 )
 POPULATION_SOURCE_PATTERN = re.compile(