I'm pretty sure they will return it to the 'FROM:' address, so I'd fill in your mom's address there... I'll tell you what I do as a matter of habit: if they provide a label, I use it; otherwise, I make up a destination (actually, an envelope, with the 'ship to' address printed BIG in the middle of it, and a 'shipping documents enclosed' note on it) and source label, both with the RMA number on the bottom, set apart from the actual address by a blank line. I make three copies of the RMA paperwork; one, I file, so I have a hard-copy; the second, I put inside the envelope that I used for the destination label ("shipping documents enclosed"), which I attach with a fully covering layer of clear 'shipping tape'; the third, I put inside the box - on the assumption that they'll lose the one in the covering envelope! Then, I flip the box all around, and on all six faces, with a big-assed magic marker, I (fairly carefully) write "RMA" and the RMA number in BIG LETTERS! It seems like most of the time, you're dealing with people who could be out-thought by a pet gerbil; so I try to make it REALLY DIFFICULT for them to screw it up! I've said it before: I'm a belt and suspenders and safety-pin kind of guy!