If it was sent from a mailing depot store then most of the time it isnt scanned on the sending end - Only get scanned on the delivery end. The reason why is - the mailing store doesnt have scanners and when usps comes to pick them up, they do not take them back to the post office desk and scan them, they simply put them in the direction they are going and they get scanned on the delivery end.
Ask and post office worker - they will tell you that.
MOST sources will not mail straight from a post office because (other then cameras everywhere) that is where postal inspector lurk - by taking it to a mailing depot it puts a barrier between you and the postal inspector because the mailing store employee cant open your pack like a postal inspector can.
I just sent a "test" package (Pictures - nothing illegal) to a friend to prove that it doesnt get scanned on the mailing end when sent from a mailing depot - it was delivered and the only tracks that showed where the delivery date and time.
Second, if the mailer puts the amount of stamps for priority confirmation on the pack and drops it in the out side box of a post office, it will do the same -just show scanned on the delivery end.
JJ Insane1