At restaurant last week, the chef came out from the kitchen, greeted me by name and asked about my satisfaction with the food, then went straight back into the kitchen. He passed many other seated tables getting to me.
I was the only customer there who went to the bar, certainly the only one who paid cash there (since the bartender had to go the the hotel front desk to make change) and apparently the only person that evening with a reservation, since the host greeted me by name after I simply said, "I have a reservation."
Now, there's no way they could know for sure it was s shop, but they were definitely playing it safe.