diff --git a/swh/web/common/archive.py b/swh/web/common/archive.py
--- a/swh/web/common/archive.py
+++ b/swh/web/common/archive.py
@@ -1338,9 +1338,9 @@
         elif obj_type == REVISION:
             missing_hashes.append(storage.revision_missing(obj_ids))
         elif obj_type == RELEASE:
-            missing_hashes.append(storage.directory_missing(obj_ids))
+            missing_hashes.append(storage.release_missing(obj_ids))
         elif obj_type == SNAPSHOT:
-            missing_hashes.append(storage.directory_missing(obj_ids))
+            missing_hashes.append(storage.snapshot_missing(obj_ids))
 
     missing = set(
         map(lambda x: hashutil.hash_to_hex(x), itertools.chain(*missing_hashes))
diff --git a/swh/web/tests/api/views/test_identifiers.py b/swh/web/tests/api/views/test_identifiers.py
--- a/swh/web/tests/api/views/test_identifiers.py
+++ b/swh/web/tests/api/views/test_identifiers.py
@@ -113,6 +113,25 @@
     check_api_get_responses(api_client, url, status_code=400)
 
 
+@given(content(), directory(), release(), revision(), snapshot())
+def test_api_known_swhid_all_present(
+    api_client, content, directory, release, revision, snapshot
+):
+    input_swhids = [
+        gen_swhid(CONTENT, content["sha1_git"]),
+        gen_swhid(DIRECTORY, directory),
+        gen_swhid(REVISION, revision),
+        gen_swhid(RELEASE, release),
+        gen_swhid(SNAPSHOT, snapshot),
+    ]
+
+    url = reverse("api-1-known")
+
+    resp = check_api_post_responses(api_client, url, data=input_swhids, status_code=200)
+
+    assert resp.data == {swhid: {"known": True} for swhid in input_swhids}
+
+
 @given(content(), directory())
 def test_api_known_swhid_some_present(api_client, content, directory):
     content_ = gen_swhid(CONTENT, content["sha1_git"])