Yea that and,
If I don't know the shop, I ask for any damaged parts and the gasket kit packaging. They may have some of that laying around but probably not for an H3.
If you get that "deer in the headlights" look "they might be a redneck"
When I do diesel repairs I offer up the damaged parts and pictures without being asked, and I'm probably a Redneck!
You could also ask them how much fluid and what type they put in, without them walking away. If they cannot answer that...........?