Maybe better off shoving it in a sack and dropping it in the septic tank than trusting british roof trusses, Crimson

And a fire would have interesting results.
Either way (serious face on) all this talk of hoarding PMs (yes, yes, guilty here too) is beginning to make me a bit twitchy.
As the Time Team troglodytes know only too well, "interesting times" are generally marked archaeologically by hoard deposition. That is, people got the wind up and hid their stash before the Bad Thing turned up, and generally managed to retrieve their wedge when things calmed down. But a significant proportion didn't, for whatever reason.
OK, it might be that this sort of squirrelling away goes on all the time, but when the Bad Thing fails to materialise they mooch off and dig it up again, so only hoards from bad times stay put. But a small number always remain uncollected, just 'cos.
In which case I'd expect diggers to be turfing up Y2K, WWII, Winter of Discontent, whatever, hoards even now, despite the advent of paper and electronic money, during developments and so on. But it doesn't seem to happen. Seems folk generally guess right as to when the Fat Lady is about to launch into an aria.
It takes the S to really HTF to trigger the nicest sparkly treasure troves.

Depressingly, the major hoard finds in this country seem to be symptomatic of 'events, dear boy' on the scale of the Fall of the Roman Empire, the Anarchy, The Civil War and round my gaff, by the invasions of Edward Longshanks.
[edited for senility. It's me birthday y'know. Don't ask.]