ooohhhhhh-- so mad , took a normal sized paperback to PO to mail today with the PBS wrapper marked "media mail" in red, asked for "media mail" at the counter ($2.53) and when I looked at my receipt when I got home the clerk had mailed it first class for $2.75. She did NOT cross out the media mail marking so I probably paid the first class rate, but will get the longer delivery time---- fuming here.

 (I didn't notice the individual prices on things as she rang them up cause the card swiper has lights reflecting off it and I also had several envelopes and a heavy book box that thankfully went  out for only $5.50 so wasn't paying attention or checking her work)

I would still bring it to the clerk's attention the next time you're in. One can only hope that it was an isolated incident, but he or she will never know about the mistake if you only post about on here.