I'm glad you have him back, and tags are the way to go. Both are chipped of course, but anyone who finds an animal firs looks for tags, most won't pay for a vet's bill to check for chips. They would either keep them or take them to the shelter, where they might or might not check them for chips.
Today I got tags for both my strictly indoor cats after reading of another board member's cat who got out. At PetSmart they make the tags right there in their own machine. Name of animal, my address and phone number while you wait. Well worth it because I know that Koko is big, fast and strong, would climb or hide if frightened, and timid Fredrica would hide and be afraid to venture more than a few feet from where she wound up after running.