I thought I heard them say during the training call to park at a pump then
1. Do the in store mystery shop and restroom check
2. Collect the paperwork and go back in to announce the audit
3. Go back to your vehicle at the pump and make the gas purchase to check the pump functionality and see if a receipt prints
4. Move your vehicle to a parking space
5. Take photos and complete the rest of the inspection
That way if a receipt doesn't print at the pump they will understand when you go inside to get the receipt for a $2.00 gas purchase.