Does he have microwave access? A good lunchbox and a couple ice packs can circumvent the fridge issue.
Things I've done in the past:
roast beef slices and cheese slices (if you do any dairy- primal style)
roasted veggies are great cold, especially broccoli
Shredded chicken with BBQ sauce and sriracha is good cold, I like it with lightly steamed green beans
With microwave: soup, any sort of casserole, stir fry
Romaine boats for tuna salad or egg salad are great
Romaine boat BLTs
Applesauce is great cold
Quiche can be made crustless and is great as cold leftovers
Salmon or tuna cakes are great cold or warm
Aidells sausages are a good compromise option (or "better" brats/hotdogs), and are great with sauerkraut or coleslaw and some mustard =)
Paleo sloppy joe mix in a sweet potato or regular potato is better hot, but definitely edible cold, and is great as a leftover
And of course, the savior dish:
http://nomnompaleo.com/post/4360193712/emergency-protein-aka-garbage-stir-fryAt a minimum, I try for 1 protein and 2 veg or fruit options
Pretty much whatever you have at home, but at work =P