I have an update on this. I was so irked, I dropped an email to Marriott online and got a call back on Saturday afternoon (!) from the manager.

He removed the charges and added notes to my account that I should not be charged for receiving packages or making 800 calls. We shall see what happens when I collect my bill tomorrow AM.

His explanation to me is that these charges are not intended for regular guests, but for people who don't stay at the property (e.g. conventioners) who have palettes of packages shipped to them. I really don't get the rationale at all, and I did highly recommend that they remove the charge on a regular basis, but I'm not holding my breathe. He also gave me a few thousand points, which was nice.

I'll be sure to advise if I am charged again tomorrow.