I just received back a book that I had mailed to another member on 3/24/08 via media mail.  The outer package was intact, there were no postal stamps or explanations on why it was return.  There was no postage due notice, no return to sender, etc.  However, the mailing address (which I had completely covered in tape before mailing) was ripped off and only my return address and the original postage was still on the package. 

I tried to look in my transaction archive to PM the requestor of the book, and the book is nowhere to be found on the archive.  I still have the original "Information to the mailer and the Information to the Receiver" that were inside the book, so I could conceivably mail the book back to her, but am hesitant to do this if she is the one who returned the book. 

Any help or advice would be greatly appreciated.

until a book goes lost or is marked received it won't be in your transaction archive.  It should be on your main page under books I've sent or something like that.  Have you looked there?

OMG, I'm such and idiot!  LOL

Thanks Leslie for pointing out the obvious.  Off to send a PM now because that is exactly where the book was listed.