Originally Posted by
wrk101
Step one with USPS: have your local carrier pick it up and make sure they immediately scan it in. I have shipped thousands of items via USPS and have never had this issue. And I never drop off at the post office. Why bother when I can get free home pickup.
As far as I know, this only works for First Class Packages (under 1lb). I do this all the time as well, but never with anything over 1lb.
I have also done with the OP did, especially when the lines are long. However, it is usually with items valued under $50 and I never had a problem.
A frame should be a larger package, it should be easier to spot. If you have pictures of the box, you may want to print them for the Post Office. I luckily had a photo when I noticed something was stuck at my local USPS after it was scanned as accepted. They found it shortly afterward.