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Hi Stacey,

From the Help Center:

The book I sent was returned to me!

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. 

• You cannot re-send the book if it is damaged.  If it is damaged, contact us to cancel the transaction.

• You are not obligated to re-send the book.   If the book was not damaged when it came back to you, and you do not want to re-send the book to the previous requestor, you can simply repost it. 

• If you do not get a reply message from the requestor within 5 days of your PM, contact us.

The most common causes for packages to be returned to sender:

• Incorrect Address. Caused by 
  • transcription errors if you hand-wrote the address
  • the requestor mistyping his/her address in his/her account
  • USPS error
• Insufficient postage Caused by 
  • Insufficient postage on the package
  • Failure to write MediaMail on the package if the PBS wrapper was not used.  (USPS will charge First Class rate if MediaMail is not specified).  The PBS Wrapper will print out with FIRST CLASS for books weighing 7ounces or less; books over that weight will print wrappers marked MEDIA MAIL
  • Writing First Class on the package if the PBS Wrapper was not used.
  • Reusing Priority Mail materials (this is not permitted!) but applying Media Mail or First Class postage.
  • USPS error.
• Moved, no forwarding address Caused by
  • The requestor moving before the book arrived (Media Mail is not routinely forwarded, unlike First Class mail!)
  • USPS error.

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. 

• The requestor can mark it received from the Lost transaction in her Transaction Archive, and you will get credit.

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it depends on whether the address was really wrong or if the PO messed up.  Sometimes they do return things that are correctly addressed.  If it is correct, take it back to the PO and they should resend it without you paying for additional postage.

otherwise, yes you are out the postage.

I would PM the person and let them know it was returned because it was unclaimed. If they want it, make them pay the postage to send it again. I don't think USPS will resend it without you paying postage again since it was unclaimed, not a problem with the delivery on their part.