We just came back from the Western on the Magic.
When we took our Disney Princesses sweatshirt and markers to Guest Services we were politely told that we had to at least attempt to get some of the signatures ourselves. They said that it "got out on the internet" that they were doing the signitures through Guest Services, and they had become swamped with requests. They did mention that after Thursday we could bring the shirt back with all of the signitures that we had collected, and they would see what they could do about getting the rest. We never did that, so I don't know how that would work.
Scott