Did the missiles themselves get demolished, or just de-warheaded and stored?
Hydrogen bomb warheads have fairly short shelf lives, a few years, because of the rapid deterioration of the tritium that helps give them their bang. As long as nobody lost the plans for how to make new ones...
Everything on the Pershing II is gone. Warheads recycled at Pantex plant in late 90s. Only Inert museum missile left that can’t be launched again sit at a few museums.