I haven't done this shop, but when I worked in a fast food joint, we were required to have inspections done by EcoSure labs. She came in with probes, wipes, and mold testers and went about the store as well as a long list of check items. The safety part from corporate was much different from the one from the health department. That one was also tedious, but different.
Myself, I had to have the ServSafe management and restaurant safety exam which covered a lot of basics on safety, food, store, etc. At the very least, I would think that would be a requirement to perform these, or a food handlers permit. I would wager to say someone with a fresh pair of eyes outside the company could be more lenient or more strict. In-house, tons of questions! Are chemical buckets at a certain ph level, are red towels used for raw food, do all buckets have towels, etc etc. as well as if daily temp logs are filled out. List could go on. I'm with you on this -- kind of odd they didn't send someone, but then if I think about it, it may cost them $150 to rent a car, $600 for a flight, $400 for a hotel, and $100-$200 more expenditure in gas and food for a company rep to head out and be put up in the area for two days. Why not pay a local $50-$200 to do it instead and if they goof it up, just not pay and try again?