I don't know how other folks are doing it thotgal, but everything I receive I have a RECEIVED stamper that I use and i include the date I received it. And I mean EVERYTHING. I got two DV's back undelivered this week - STAMPED RECEIVED by me on X date"
Or even write it in a corner or something. As for usps, hopefully it's just an updating issue. Otherwise, give them a call and find out whats' going on.
GL!