I will say this is an unusual situation.  I had a member PM they sent me 2 books by accident.  When I get them they are hoping I will take the one not intended for me and pay the postage to ship it on to it's rightful owner.  ok, we all make mistakes.  When I did this I at least offered to pay the postage.  Well, short version, she printed my wrapper twice, so she only paid postage once.  They wanted $3.00 postage due from me to get both books, as they explained using a photocopied DC is illegal.  So now, it will cost me $6.00 extra if I accept.  If I refuse, the credit has already been taken from me because of the delivery confirmation.

What does everyone recommend

TIA

Ask her to buddy you 2 credits one to pay for the postage due and one to mail it to the rightful member. If she chooses not to do this you can always refuse the book. Mistakes do happen, but she should compensate you for your lost money if you are willing to do as she is asking.

Edited cause I can't spell.

I would say it's perfectly all right to not accept the books because of the $6 postage due.  They should send them back to her to pay whatever postage is due for her mistake.  Then don't mark the book as received since you technically never received the book.  You'll get your credit back when the book goes lost.  She'll get the books back and can send them out again with the proper postage. You should not have to pay for her mistake.  If she wants you to accept them she need to send you 2 credits to cover the postage due and another to cover mailing the book to the 3rd person. 

ETA: 1 credit won't cover $6 postage due. 

That's a good suggestion, but I think that part of the problem is that the OP doesn't know which package contains the book she wants? How can the unwanted book be refused? And will the OP have to pay the postage due on the book she wants to keep anyway?

ETA: Also, I thought the $6 was $3 to get the book and another $3 to send the extra book along?

She should definitely offer to pay any postage due to get the books and to send the wrong one on. I did the same thing and had no problems with the DC. I was able to tell which person was getting the extra by the double scans along the way. It was interesting that both books stayed close the whole way, scanned within minutes of each other.  If she refuses to pay postage to accept them, this is the one reason that PBS allows refusal to accept delivery. Let them go back to her and let her pay to straighten it out. You do not need to mark the book as received (as long as you refuse them and are not in posession of the book). You will get your credit back from the system when it goes lost.

I took it as there will be a 3.00 postage due for both books and then another 3.00 to mail it to the rightful member.

"she printed my wrapper twice, so she only paid postage once."

One book has been paid for, so only one should come postage due.

The DC/printed postage can't  be used twice!  This is illegal.  You should refuse the earlier-mailed book and contact R&R.  This member is breaking the law by trying to use the same DC/printed postage for more than one mailing.  She may not know that this illegal (although duhhh....) but if that is the case someone has to tell her. 

It sounds to me like she printed the wrapper twice by mistake, I don't think she was trying to rip off the PO. She had two books going to two different members, but printed the same wrapper twice.

OK. I misread that. I thought they were charging her $6 postage due. Duh.  So yeah 2 credits would cover it.  I think the best thing is refuse both books since you don't know which package actually contains your book.  Or at least refuse the postage due one. If she printed the label twice and mailed them off at the same time there's no real telling now which one has your book inside and which one is the extra one.  The PO has no way of knowing if the book in the package was actually the book the label was printed for. They just know that the DC# was used twice. 

I would try contacting PBS about this before I did anything. Is there a deadline by which you have to get the books?  Have you tried asking a Live Help person?

Printing the same DC more than once CAN be done and very easily, Once a DC is assigned to a book, the same one prints every time that label is reprinted. So if you reprint a label and attach it to the wrong book, you will be sending it out more than once. I really doubt that she did it with the plan to do something illegal, what would that get her? Sending the book to the wrong place won't gain her a thing.

If it were me, I'd follow the suggestion of a couple others and refuse both books and PM her to let her know this.  When they are returned to her, she can send each on to the rightful owner.  If she complains about paying postage twice, well, too bad - it's her fault.  Don't mark the book received.  Let it go lost in the mail.  If she agrees to send it again and you receive it again, you can mark it received through your transaction archive.  If she does not agree to send it again, once it goes lost in the mail, you'll be added back on the WL for this book, in the #1 spot.

If I were the sender in this case, I'd really appreciate a heads up, and would be more than willing to reimburse all postage costs, either with credits or a check, whichever you preferred.  And I'd buddy an extra credit to you if you  would be so kind as to send the book on to its correct destination.  I would feel silly having printed the same label twice (so easy to do!) and would be rolling on the ground with gratitude (don't work too hard picturing that) if you could find a way to help me right my wrong.