[Dude Here]

I have a co-worker who used to work for USPS and from what he tells me, this is a very common occurrence. When you send out a package, using the priority two day boxes for example, it must be delivered in two days no ifs ands or buts (excluding extreme weather or emergencies of course).

He tells me that when they would get really busy, like during the holidays, priority packages would start to stack up and cut it close to the limit of making the delivery date. He said that on more than one occasion the supervisors or office manager would gather all the packages that were due but weren't going to make it out that day and scan them all as delivered. This kept the heat off of the office for not making deliveries on time and the packages generally went out the next day or maybe the day after.

Long story short: wait a day or two.