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From the help center... I typed in "returned book"
Please contact the requestor to let him/her know, and to confirm the proper address. If the book has already been declared Lost in the Mail at PBS, you should not re-send it unless she/he confirms that she/he still wants it.
The most common causes for packages to be returned to sender:
If the requestor still wants the book, and you decide to re-send it, it may be declared Lost in the Mail before it arrives.
I had one returned mysteriously. Had notes written on it that USPS had not been able to deliver, and that address was not adequate. When I contacted the other member, he said he lives there, address was correct and complete, and he'd been getting other mail and other PBS books. I took it back to my PO, and they sent it on its way with the same postage. Eventually he got it ok. So we never had any clue what had happened the first time.