Make sure you go over the truck carefully before taking it back.
Open the hood and inspect all the brackets behind the grill and go underneath and make sure all the clips and bolts are installed right.
Make sure the hood opens and closes properly.
Check all the body gaps between the affected panels and the paint quality.
Look at the truck from all angles to make sure the paint match is correct.
Make sure all the lights work, and then check the headlight alignment/aim.
Take a few pics from all different angles in case you miss something you may have a pic of it to show it didn't happen after you left.
Bring someone with you that can help inspect the truck with you.
Much easier to get something straightened out BEFORE you authorize their check from the insurance company.
Good luck, man.