mail fraud - what would you do?

[aqwut]

They don't leave anything on my door step unless I request it to be... most/all of the time they leave a slip to pick it because they need a signature inorder for it to be released... when I get USPS, if I'm not home and it's too big to fit in the locked mail box.. they'll leave a slip.... Contact USPS, because they have no proof that it has been delivered... ask them where's the signature?..