diff --git a/src/documents/sanity_checker.py b/src/documents/sanity_checker.py
index b8fd73f98..bc0b689d4 100644
--- a/src/documents/sanity_checker.py
+++ b/src/documents/sanity_checker.py
@@ -56,8 +56,7 @@ def check_sanity():
             messages.append(SanityError(
                 f"Thumbnail of document {doc.pk} does not exist."))
         else:
-            if os.path.normpath(doc.thumbnail_path) in present_files:
-                present_files.remove(os.path.normpath(doc.thumbnail_path))
+            present_files.remove(os.path.normpath(doc.thumbnail_path))
             try:
                 with doc.thumbnail_file as f:
                     f.read()
@@ -72,8 +71,7 @@ def check_sanity():
             messages.append(SanityError(
                 f"Original of document {doc.pk} does not exist."))
         else:
-            if os.path.normpath(doc.source_path) in present_files:
-                present_files.remove(os.path.normpath(doc.source_path))
+            present_files.remove(os.path.normpath(doc.source_path))
             try:
                 with doc.source_file as f:
                     checksum = hashlib.md5(f.read()).hexdigest()
@@ -94,8 +92,7 @@ def check_sanity():
                     f"Archived version of document {doc.pk} does not exist."
                 ))
             else:
-                if os.path.normpath(doc.archive_path) in present_files:
-                    present_files.remove(os.path.normpath(doc.archive_path))
+                present_files.remove(os.path.normpath(doc.archive_path))
                 try:
                     with doc.archive_file as f:
                         checksum = hashlib.md5(f.read()).hexdigest()
@@ -106,8 +103,7 @@ def check_sanity():
                 else:
                     if not checksum == doc.archive_checksum:
                         messages.append(SanityError(
-                            f"Checksum mismatch of archived document "
-                            f"{doc.pk}. "
+                            f"Checksum mismatch of archive {doc.pk}. "
                             f"Stored: {doc.checksum}, actual: {checksum}."
                         ))
 
diff --git a/src/documents/tests/samples/simple.png b/src/documents/tests/samples/simple.png
deleted file mode 100644
index a3a768401..000000000
Binary files a/src/documents/tests/samples/simple.png and /dev/null differ
diff --git a/src/documents/tests/test_consumer.py b/src/documents/tests/test_consumer.py
index 8ead1ea41..a6f0cc55a 100644
--- a/src/documents/tests/test_consumer.py
+++ b/src/documents/tests/test_consumer.py
@@ -5,14 +5,12 @@ import tempfile
 from unittest import mock
 from unittest.mock import MagicMock
 
-from django.conf import settings
 from django.test import TestCase, override_settings
 
 from .utils import DirectoriesMixin
 from ..consumer import Consumer, ConsumerError
 from ..models import FileInfo, Tag, Correspondent, DocumentType, Document
 from ..parsers import DocumentParser, ParseError
-from ..tasks import sanity_check
 
 
 class TestAttributes(TestCase):
@@ -183,24 +181,6 @@ class DummyParser(DocumentParser):
         self.text = "The Text"
 
 
-class CopyParser(DocumentParser):
-
-    def get_thumbnail(self, document_path, mime_type):
-        return self.fake_thumb
-
-    def get_optimised_thumbnail(self, document_path, mime_type):
-        return self.fake_thumb
-
-    def __init__(self, logging_group, progress_callback=None):
-        super(CopyParser, self).__init__(logging_group, progress_callback)
-        _, self.fake_thumb = tempfile.mkstemp(suffix=".png", dir=self.tempdir)
-
-    def parse(self, document_path, mime_type, file_name=None):
-        self.text = "The text"
-        self.archive_path = os.path.join(self.tempdir, "archive.pdf")
-        shutil.copy(document_path, self.archive_path)
-
-
 class FaultyParser(DocumentParser):
 
     def get_thumbnail(self, document_path, mime_type):
@@ -223,8 +203,6 @@ def fake_magic_from_file(file, mime=False):
     if mime:
         if os.path.splitext(file)[1] == ".pdf":
             return "application/pdf"
-        elif os.path.splitext(file)[1] == ".png":
-            return "image/png"
         else:
             return "unknown"
     else:
@@ -538,19 +516,6 @@ class TestConsumer(DirectoriesMixin, TestCase):
 
         self._assert_first_last_send_progress(last_status="FAILED")
 
-    @mock.patch("documents.parsers.document_consumer_declaration.send")
-    def test_similar_filenames(self, m):
-        shutil.copy(os.path.join(os.path.dirname(__file__), "samples", "simple.pdf"), os.path.join(settings.CONSUMPTION_DIR, "simple.pdf"))
-        shutil.copy(os.path.join(os.path.dirname(__file__), "samples", "simple.png"), os.path.join(settings.CONSUMPTION_DIR, "simple.png"))
-        m.return_value = [(None, {
-            "parser": CopyParser,
-            "mime_types": {"application/pdf": ".pdf", "image/png": ".zip"},
-            "weight": 0
-        })]
-        doc1 = self.consumer.try_consume_file(os.path.join(settings.CONSUMPTION_DIR, "simple.png"))
-        doc2 = self.consumer.try_consume_file(os.path.join(settings.CONSUMPTION_DIR, "simple.pdf"))
-
-        sanity_check()
 
 class PreConsumeTestCase(TestCase):