Found out my usual clerk at the post office has been transferred, and she wasn't allowed to train anyone... I am real frustrated over what just happened. Mailed out 6 books with delivery confirmation, clerk did not know how to process it, and kept putting usps labels over the delivery confirmation numbers, so this means I will not get any instant credits.  She kept saying my tracking numbers were not valid, and was very rude about the whole thing.   Not sure how I will send books anymore..  Probably skip this site's delivery confirmation.  I have in the past take in the directions from this site, but clerks are real hesitant and have refused to look at the directions.  Any advice?  thanks 

Go online to USPS and file a complaint that they do not know how to process pre-printed labels.  Also see if you can find the number for your regional postmaster, you can contact their office to make a complaint.  Despite it's many faults, USPS does still take complaints seriously.

BTW if your counter staff attempts to cover your barcodes again, insist she not do so.  If she doesn't cover or deface yours they should still pick up scans enroute and trigger your credit transfer.  If she merely adds a new one without covering your pre-printed, both should scan enroute.

I will go online to usps and see what I can do..  I asked her not to cover my barcode, but she did it anyway.  She was convinced that my number means nothing to the post office, and I even said...it eventually gets scanned.  This had happened to me with a different post office years ago, and that is why I was so thankful for the clerk who knew how to do it correctly.  I did print out the instructions from this website and will take it next time and hopefully they will try it.   

Many of us here don't feel the need for paying more for DC unless you are desperate for a credit as soon as you mail out a book.

Debbie, post office clerk that helped me today had never seen a paperbackswap shipment before. She tried to sell me another d.c. for $1.05. She was getting the dc number invalid error also. 

Jeanne, I only get a d.c. if I'm sending a hardcover. If I'm going to pay for the extra weight to ship a bound book it's worth it to me to know I'm guaranteed the credit to offset the postage cost. 

I have decided not to use DC and it was so much easier.  Sent out 3 books today, and just hope for the best that receivers will mark books received.  If I receive a response from usps stating that they will be able to train others at post office, then I might go back using it.  

 Sent out 3 books today, and just hope for the best that receivers will mark books received.

I stopped using DC on all my packages as soon as I realized how expensive it really is. (I've only had a couple of books out of more than 1500 mailed that were not marked received).

You have to pay 53 cents to use PBS DC (30 cents to PBS plus 23 cents to the PO).

I've mailed out over 1700 books ... if I had used DC on all of those packages, I would have paid over $850 just for DC alone. When you put that against the 2 books I've mailed out  that were never marked received, and the fact that you can buy credits in the Book Bazaar for less than $2.50 ... I could have purchased at least 340 credits with the money I've saved by not using DC.

The $850 I've saved more than offsets the $5 I've lost.

Use paypal shipping.  Delivery confirmation is free with First Class and 0.23 for Medial Mail and I have never had a problem with the post office scanning the barcode.  Also if package is over 13 ounces I can just drop in mailbox.