Mech didn't do as asked but charged?

[iwillnc]

So I took my truck to my local mechanic I've trusted for a long time, asked for my tranny to be flushed and the filter changed, as well as the transfer case fluid changed


I wasn't sure based on the receipt if he had changed transfer case fluid so I got under and looked, turns out he had but I then noticed something else.

I was looking at screws where you could see where they used tools on them and some of the bare metal was showing through the dirt, the skid plates had been removed, youi could tell he had undid the drain screw on the tranny but hadn't touched the transmission fluid pan, all of the screws going around the pan were clean and untouched, is it possible that he had flushed the transmission and changed the filter or did one of his guys take the easy way out?