Have him text you a picture of his driver license, with everything marked out but his picture and home address.
Now you have his ID, home address (so you can check out his house on Zillow) and positive identification when he shows up. If he's not willing to do that, bid him adieu. Whenever I buy something and am going to someone’s house to pick it up, I always look up the house on Zillow. Lets me know what I’m driving to, plus I’m nosy.