Welcome to the wonky world of mystery shopping where one is to do as directed and not question the rationale, wisdom, or anything else about the assignment.
I can't be certain of what that the MSC/client is examining, but if something is wrong with the order, it's not supposed to be looked at or brought back behind the counter and fixed. It's supposed to be thrown out and a new order prepared. No questions asked.
In the olden days, when the golden-arched burger joints were shopped, it was strictly about the timing, to the second, of the service. So much so that the MSC sent a stopwatch to shoppers who were supposed to discreetly use it to time and record the various times the report was tracking without being detected as the mystery shopper.
Whether the food was hot, cold, tasty, or correctly provided as ordered was irrelevant.
But if you received only one napkin in the order....that was a reportable offense.
There was a grocery shop in a bare-bones, four-letter-branded store with locked-down shopping carts where one was to examine ALL of the "milks," as they were termed, and determine if any were expired. "All" included the ones in the racks in the storage cooler. Potentially hundreds of "milks" for the shopper to somehow discreetly examine for a whopping shop fee of $3 and a $5 reimbursement.
These were mystery, not revealed, shops,