I think if you have some coin's which are not of use now or have lost their value or are not working,  I will prefer or advice you to not dumb or to dispose them as these coin's.  Infact you should keep them in your wallet,  and forget about them.  As there are possibilities that in future these coin's will revive, and for now whom you are thinking of no use will prove to be  huge change.  And I don't think so that there is some violation of rules by keeping then in your wallet.