We've left our laptop with Bell Services before, no problems. I believe DH filled out a slip of paper stating it was there, etc., and when they brought our things out, they had him check it.
He told the CM it was there when he first dropped our things off. They're used to it, and probably plenty more.
We've checked in to ASMu as early as 6:15 or so in the morning with no problems. Our room was actually ready, but when we checked into Pop early, it wasn't. We just got our tickets and went on to the park for a few hours.