The restricted liscense he received (the green sheet) serves as a Class 1 ID and will work for his ID for drinking. The waiters/waitresses don't know this, so get the manager, they'll ok it.

You cannot have an ID Card and a Driver's License at the same time, one will be void, so don't bother attempting to get the ID Card.

He'll have to talk to the DMV about how to get the green sheet notarized. If it was restricted for drunk driving, it will have to be notarized by ASAP. If it wasn't for drunk driving, I'm not really sure how to go about getting it notarized.

Once the green sheet is notarized, it will take up to 8 weeks for the paperwork and other ish to go through at the DMV before they can give him a plastic photo DL. The green sheet works as an ID for alcohol and COULD be his DL for the full 6 month period once notarized if he doesn't care to visit the DMV.