Do you have a time-table of when he comes in? This is important, so when you contact the authorities, they can at the least, station themselves outside and ask the gentleman WHY he is changing his appearance.
It's a weird situation, and I'm giving you the benefit of the doubt you aren't putting us on...:~)
sw
I wouldn't want the authorities to waste their time on this man if he works for a convience stand or something, and is just buying for it. He comes in once every 2 weeks.