Throw them away if the reason you swapped them out is because they are ratty. Having old, sh!tty valves around will only lead to confusion later, and won't help your situation any.
+1 on this. I'm not a big "mess with the tubes" guy, but I do have a box of ratty, broken, and worn bridge parts and machineheads for that "just in case" rainy day. Some of them are going on 30 years old now :roll:
But if they're ok, and you're asking "could I get some dosh for these?" - I dunno, the tube experts would have to say...
Seeing as no-one's jumped in with "hey! how much do you want for them?", I'm guessing they might not be worth the effort of trying to shift them :lol: