The bar code on the delivery confirmation ticket is scanned in when sent and scanned in again when it reaches your post office.
Priority mail is a two day service that in is extremely reliable.
I suggest that you send all videos in a box. VHS tapes are made of brittle plastic that can shatter or crack if not properly handled. Tapes will be returned in a box and also in black plastic protective cases to minimize risk of damage. Priority mail is very reliable, but mistakes can be made during shipping. Postal workers tend to be very careful with packages that have the blue insurance stickers on them.