score:5
I have done this once, the FAQ entry I worked from is here. Your parents need to have:
A notarized letter from you authorizing your parents to carry the stuff on your behalf.
A copy of your passport name page and anything you have showing your status in the US.
A list of every item they are bringing for you. The more detailed and organized the list is, the less likely they are to bother checking it.
A filled in CBP Form 3299 signed by you.
If you brought it yourself you would still need the list and your documents showing status, but you'd fill out a CBP Form 6059B instead.