Letter Sent To Job

One of my supervisors walked into my work today and said hey do you still need this and it turns out it was a letter from the counterintelligence place basically just confirming my work and everything because it was addressed to her and it was asking like is this person fit to have a clearance this and that. It’s probably been there for a few weeks and I just sent it back today. The clearance is for military, so I’m wondering if me not sending letter back in a timely manner could affect things. I just put it in a dropbox today. Thanks