Find out if they have a velcro item that will help keep things from rolling from your cargo area to the seats. The "Smart french fry" as I like to refer to it is less than 2" swuare in cross-section but is as long as your cargo area is wide. These things are like $20 but can be used to make bags and boxes snug-up just perfect. The velcro attaches to the carpet and the french fry can be bent into any shape along the carpet. It's great!
Also - find out if they have installed your front license plate holder. If not, consider a no-holes plate holder like
the one here or ask them to install the front plate holder for you if you need it.