Put them in a box and keep them as back ups.
I sold a NIB remote for decent money (~$15 ??) a while back. It was for a 722k (and others). Our current remote was acting up, so I got a replacement from Dish, but then the original went back to normal !! So, I held on to the replacement, knowing I'd probably need it one day.... I never did though (plus we got a Hopper/Joey system).Best advice. They're a nickel a dozen on eBay.