It might not be safe to pick up -anything- (or just receipts) in an AM
pshop, this might get you heavied
. It's safer to ask the shop owner or their staff to get the items for you.
For more information see this thread: 
For what I can tell, it hasn't. It's just that picking up theft receipts was the exception that did cause heavying, for complicated reasons in the code.
(Should be fixed now. Maybe try it first on a character you don't care much about. ;))