Its a stress thing. The stress of the move sends them into a shed cycle.* You can pretty much bet on a BP shedding right out of the box. Hasnt failed me yet.
[*disclaimer...this is a regurgitated statement.]
As for the UPS drivers, a new guy delivered my last package and had the box upside down. The other guys know that a package to my house is usually a snake and they handle it appropriately and even wait around for me to open the box to see what cool color snake I received. Lol oh ma, the non-herper world is funny. People who arent part of the magical world of keeping herps need a nickname, like Muggles in Harry Potter.