In Jan. at Mobile dock, I got stopped by customs because we had gone horsebackriding. So they pulled us behind the partition and started asking questions. I had 18 bottles of booze. When he asked if I had any I nodded yes, he asked how many I said 15. He thought about it and then let me go. I've heard they don't like to do the paper work so they let you on thru. Thank goodness!!
When I fill out my customs card I just put that amount under souvenirs and don't list it as alcohol.
Also if your going to stock up on alcohol from the ship, get it the first day when a lot of it is on pre-sale. Saves money!