If the government ever wanted to get their hands on your gold, there are much easier ways of going about it than kicking down doors at 6 a.m. to ransack a house because of some receipt from HGM a decade ago.
Why go to all that difficulty and expense when you could make the sale of gold illegal... unless the buyer is the government. That'd hoover most of it up. Sure you could 'stick it to the man' by burying your stash in the woods, but you nor your kids would ever be able to realise its value unless you sold it on a gold black market. Then the government could go after the black market in