I requested a book on the 10th and it was accepted on the 12th.  The label was then printed, marked as mail and DC was posting as 'Electronic Shipping Info Received' all on the evening of the 14th within just a few mintues of each other.  I understand how the label being printed and it being marked as mailed being so close to each other, figuring the sender marked it as mailed right after printing the label.  But I don't understand how/why DC shows up at the same time and why nothing else has posted since then.  Since it hasn't been 'scanned' does this mean it hasn't really been mailed yet?  Just curious how it all works, still getting the hang of it!  Thanks.

*Also, the 'en route to me' map shows it over half way to me, how do they know where it is if nothing is showing up in the DC section?

Electronic shipping info received will be generated at the same time as the label.  As for whether it's been mailed even though it hasn't been scanned--it varies. I've had labels scanned when they got picked up, some scanned only when they were delivered, some scanned at multiple points along the way, and others never scanned at all, and I only know they arrived because they were marked as received.  So, it may or may not have been mailed yet. 

The en route map is just a pretty graphic--it doesn't actually know where the book is--mine are often off the coast of texas.