Personally, I'd be very careful about used frames, especially with comb. Selling nucs isn't the most ethical way to cycle out old comb, and when it comes time for me to sell nucs, I'll try and keep the comb within a couple seasons' age.
Boxes, lids and bottom boards aren't that big of a problem. Just clean and repaint the bottom boards, and scorch insides of lids and boxes. One tip I'm going to implement on 240 used boxes I recently bought is to skip the propane torch and borrow a large propane camp cooker stove. Supposed to be faster. Just watch those sleeves!
Might be a good idea to scrape residual wax first, too.
Lots of folks advocate dipping used woodenware in paraffin, but I'm not sure how that would prevent eventual release of AFB spores. Anybody care to explain?