As you add items to your rig, and clean/prep/load it, you'll find the builders have left you a whole bunch of gifts, presents, and suprises.
Your sure to find sawdust, styrofoam bits n pieces, pieces of wire and wire insulation, carpet pieces, staples, nails and the ever present screws.
Possibly round pieces of wood panel from hole cutters.
And if your real lucky, sometimes the builders will leave you a tool or two.
All these little gifts are the employees/builders way of saying "thanks for buying our product"