FBI background check is being sent late - What's going to happen?

[mollybloom]

I completely forgot to mail my FBI background check. It's been sent now and I've notified them it's going to be late. They gave me an additional 30 days. It's going to take longer than that, so I informed them again that it's going to be late.

Are they going to refuse my application because of this, or is it sufficient that I've let them know?