Several years ago, I lost my driver's license traveling. Fessed up to TSO at ABQ, and emptied out my wallet - multiple credit cards, frequent buyer cards, library card, all in my name, and the kicker - a Costco Amex with photo id. He waved me through, though he did make a show of looking through everything and comparing me to the photo. (of course, I fit the profile of middle-class, middle-aged white lady in business suit, unlikely to be typed as a threat in any case)

With the two photo IDs and temporary DL, your son's in fine shape. My suggestion to him - dress as neatly as possible, act respectable/respectful (these two only because of age-stereotyping), show whatever photo IDs he has and temporary DL, perhaps have something else showing the same address as on the DL. Don't bother to hide the loss of the license. There may be a slight delay, but he should get through.