[csteubs]

Having to handle lead for a practically unretrievable amount of gold would (I hope) be enough of a deterrent for the vast majority of "citizen scrappers". Worst case, I think a Pb/Au scrap grey-market would look something like the current catalytic converter market, where raw materials are purchased at set rate by an intermediary and then sold for further processing. Most people know there's gold in their computer parts, but still opt for the recycling bin/ziploc bag in a junk drawer.

[jacquesm]

Nah, they'll just drop it in a smelter and sort it using gravity.

[rajamaka]

It might deter those in wealthy countries, everywhere else would be another story.