We all worry about being found out while mystery shopping. One time, on a restaurant assignment, part of the shop required a visit to the restroom to observe if there was a cleaning schedule posted, and if it was current. As I was studying it up on the wall, in comes the cashier who took my order! Yikes, I didn't know what to do, so I casually smiled and said hi, and returned to the dining area. Thankfully my order just came up. I grabbed it and high-tailed it out of there!
No, thankfully no photo needed. But I was to read it and see if it was current. I got a quick enough glance to see that it had been.
It's funny because I always ask for a receipt anyway, so that I can get my Fetch Rewards.