Did you apply electronically? For example by sending a resume via email or automated system. If so you can't be sure an actual person ever saw your application. You may have gotten an automated date delayed response.
5. Should I attach the resume in an email or paste it? Your method of sending a resume via email may depend on the hiring manager’s preference. Sometimes it's listed in the job description.
Brassaii's How to in 2 - Sending a Resume via Email