diff --git a/swh/storage/in_memory.py b/swh/storage/in_memory.py
--- a/swh/storage/in_memory.py
+++ b/swh/storage/in_memory.py
@@ -215,7 +215,10 @@
         keys = list(set.intersection(*found))
 
         # FIXME: should really be a list of all the objects found
-        return copy.deepcopy(self._contents[keys[0]])
+        list_to_return = []
+        for i in range(len(keys)):
+            list_to_return.append(copy.deepcopy(self._contents[keys[i]]))
+        return list_to_return
 
     def content_missing(self, contents, key_hash='sha1'):
         """List content missing from storage