They don't do much. They uncrate, attach the seat, attach the levers, attach the fan cover and over inflate the tires. My hour meter was 0.0 when they delivered it.
Best to look over the entire mower. Check fluids, check wire routes, Check deck and belts, etc. Build a relationship with your mower ;-)
I added the mower height label with inches from this thread:
http://www.lawnmowerforum.com/showthread.php/36513-Hustler-Rapter-sd-54 and also added a pre-filter pn: 11013-7046 to the air filter before 1st use.
The manual lays out what you should check. Then gas-n-go
I did have to add hydro oil after the first use.
Enjoy