Hahaha!! These are hilarious! I really enjoyed reading them...and got some good tips, too, to try to not be outed.
When I used to do Chase Bank shops years ago, we were buying and selling homes. The guy we worked with knew I was a mystery shopper because we worked so closely with him for so long...for personal reasons, and got lots of information from him. Then I would go in for a shop, acting completely unlike my talkative, inquisitive self, and have him "lead" convos...he totally caught on. I had to give up Chase Bank shops, (he called all nearby branches, too) and every time I would go in, he would ask me about shopping.