After mailing and receiving hundreds of books over the past few years, something new (to me) has happened.  According to PBS DC, the post office is showing that the package was delivered to my house.  I never received the book.  I went to the PO and the oh so helpful (sorry for the sarc...) clerk gave me the carrier's phone number to call tomorrow morning.  Maybe this will result in something as our carrier is usually very on top of things.  Meanwhile, in a burst of what might not be my most brilliant moment, I went ahead and marked the book received.  Clearly the sender did their part, I wanted to make sure they got their credit.  But, prematurely I realize I might should have handled this differently?  Should I have marked that I didn't receive the book?  I suppose it is a moot point now. 

it might have been misdelivered maybe a subsuite carrier you shouldnt have marked the book if you dont have in your hands

From the Help Docs:

I got a PBS email saying a book was delivered to me, but I didn't get it!

If you have received an email from PBS telling you that USPS has recorded a book you requested as having been delivered to your address, but you did NOT get the book, this means that USPS has scanned a book sent to you with PBS Delivery Confirmation as "delivered".

If you have not received the book, the possibilities are:

• The book has been misdelivered
• The book has arrived at the PO, but hasn't been delivered to your address yet.

What should you do if this happens?

• You should discuss this with your mail carrier (perhaps the book was misdelivered to a neighbor), and your local PO (the book could be sitting in your Post office, waiting to be collected by you).
• You can also contact the sender, who can contact USPS as described in the Help doc A book I sent is lost in the mail!  to report the misdelivery and try to have USPS locate the package.
• You can contact the sender by clicking the PM (Personal Message) button on the transaction for the book in your account.

• If the book is still listed as "en route" to you, it will be on your En Route to Me tab on your My Account page.

• • If the book has been declared lost in the Mail, it will be in your Transaction Archive (linked from My Account).

No need to mark the book received if you have not done so Teresa.  It appears the book was traveling under a DC that you were watching?  In which case the sender has already (automatically) received their credit, the only credit up for grabs is/was yours.  If you did not receive the book and let it go 'lost,' your credit would be returned and you would be returned to your previous position on the wishlist.

But yes, speak to your USPS carrier (missing packages sometimes turn up)...although I'm suprised your local postmaster isn't doing the follow-up, mine would.

Our mail carrier is awesome, the rest of thegroup at the post office...not so much.  The book did miraculously turn up today so I am very happy!  :)  Lesson learned on how to handle the situation next time though.  Thanks for the help! 

YAY for found books!