I got home from mailing a book and 2 raoks envelopes and the postal manager had charged me media mail rates on all 3 of them.........on Monday do I go back and point out their mistake?  I told him only the one package (with "media mail"  printed on it) was a book and should go media mail.    Told him the other 2 were 'paper goods' as they were packages of cards I was sending to some PBS members. Their credit card screen had bad lighting so I couldn't read anything on it as he rang up each item or I might have noticed it while still at the counter.

Did the 2 envelopes get sent out with the media mail book package?  If so, probably nothing you can do.  The post office, in general, does not usually give refunds - not once you've left the counter / area.  I think there's something in print I remember seeing in my post office, but it's been so long that I paid any attention to it.

-- Jill

If there is more postage due you might find them in your mailbox on Monday. or the package may arrive at recipient's address with postage due. If you paid too much you could say nothing and help the p o out as they are having issues with a deficit of their own.

I'm thinking I overpaid as first class is often cheaper than the $2.72 for a typical book mailed media mail.   I wasn't really thinking so much about the money, but I didn't want to be accused of mis-using media mail.

Since the mail has already left your p.o. and/or gotten mixed with countless other pieces of mail, there's nothing more they can do at this point. (Technically, you could re-call both envelopes, but that would cost at least $10 each. Not something I would do.)  So, I wouldn't mention it to them.  Hopefully, the mail will go through, get delivered without a hitch.  If it were to be opened, inspected, and the receiver(s) charged a postage due amount (like for the difference between what was charged and the priority mail rate), then, of course, you should re-imburse that person(s) for the postage due.

We've found that you really have to watch the counter clerks and the transaction as mistakes do happen, more so if the line is really long.

-- Jill B.

What Gordon said.  Not much you can reasonably do at this point except be more aware in the future (and hope the packages don't arrive postage due).