I have now seen the same scammer twice at the same place. Not mere coincidence, it seems.
I noticed an older (60's) man with long grey hair in clothes that look like he does mechanic work or something similar. He was stopping to talk to everyone that was filling their gas tanks, with a lit cigarette in his hand, gesturing wildly. I thought it was odd the first time, and was going to call the store back later to report it, but I forgot. Today, I saw him again. Stopping to talk to other people with his cigarette lit at the gas pumps. I don't know what his game is, but I think I will give them a call.