If it is a convention center and they are large convention materials, I can see it, but if it is a box of personaly stuff (not a crate) I would refuse to pay. Or have a conversation with the GM and explain to him that you will pay and promptly check out and send a letter to Mr. Marriott. I stayed at Marriott properties 220 nights last year and had a number of strange requests and I have never been charged (or at least out of line).