I used to use DC for all the swaps I was in, I figured that as long as it had that code to be scanned if something happened it could be found. Then I was told at my PO that you cannot track with DC as they only scan the code when it reaches its destination, where if you pay for tracking it is scanned at each PO it gets to on its journey. I now look at DC as something to use if I won't be sure the receiver of the item would let me know they received it, and I am not worried about that with swaps.
Angelmom, I have heard of things sometimes taking a very long time to get where its going as Shauna said, so hopefully it will still arrive.