I mailed a book for a book swap at the small post office.  I bought the postage and DC there at the counter, on Dec. 3rd.   When I check the tracking website, it says something like "no information on this package."    Will this book get to its destination?  Or is it destined to get lost? 

Nothing to worry about at all if what you bought was DC.  That means delivery confirmation and it may not be scanned until then.         Not to worry.

And it sounds like you used the USPS Green Form?  Those will never show up here at PBS, but they will show up at the USPS site under tracking.

I got the green DC strip from the P.O.  , and checked the USPS tracking site. 

Read this thread, it will be helpful to you:

http://www.paperbackswap.com/forum/view_topic.php?t=88775