3 weeks ago when we went, I could not find shorts locally (being the middle of Winter in Wisconsin), so I found them on Walmart.com and order then and had then shipped directy to the hotel. They used UPS, and the package was there when we checked in.
We did order some autograph books from Disneysmilestore.com, and they were shipped US mail, and it took forever to get. They were mailed on a Tuesday, priority mail (2 - 3 days), and we checked in on Friday, but they were not there. We keep checking with the front desk and they told us that all US mail to the Disney hotels, goes to a central location and is distributed that way, even if it is addressed directly to the hotel. We finally got out books the following Tuesday, after spending 3 days at the parks. We had 3 X 5 index cards along just in case the books did not make it.