Fedex operates an on site facility NW of Hangar A. I might give the FedEx Office store at 920 426 5580 a call. I think it's something like $5 a box over and above whatever your shipping charges are (collected when you pick up).Note when talking to the locals, the event is called "The EAA" rather than Airventure (a term nobody but EAA marketing uses, to everybody outside of Wisconsin, it's just Oshkosh).