Susie, the check-in for returned dvds should improve to no more than 2 days from the time you stick it in the mailbox. This is with the new USPS scan system. They plan, or maybe already are, sending the next one from your queue as soon as the USPS tells them one is on the way back. As for outgoing from them, I don't understand why it would ever be over 3 days in transient. Yours shipped 12/13 should definately have gotten to you Friday or Saturday. Possibly the Holiday storm slowed it. I received one shipped 12/13 on Friday. Have received several in 2 days. If they just get it down to a 6-7 day total turnaround should end up with at least 12-15 a month with a 3-pack which IMO isn't bad for $16.99.
Seem to have one possible problem to worry about, I have received 2 mailers that were torn partially open at the bottom serated edge and one enough that the dvd in the sleeve could have easily slid out.