1/10g "Paper Gold" Notes

Gimmick.
Just with the hammered coins of centurues ago, little bits can be clipped off them. Simple to check if you weigh them,
but at the point of private sale, how many likely buyers would carry a scales with them, just in case?

I don't know of a way of checking the weight of a bar or coin on ebay, before deciding to make a bid.

Might be OK for smuggling with the thin sheets sewn into clothing. Illegal immigrant boat people do that.
Problem solved if they have to jump into the sea. Tragedies like that happened with the foundering of the Spanish Armarda in 1588.

Interesting, but preying on those who don't know the spot price of gold. In today's world, one ounce coins are a better option, even to sell at spot. In a post-apocalyptic world, where one would assume having really small amounts of gold for purchases would be beneficial, he who owns the gold sets the prices (it's the same basic principal today, only a lot of people own "dollars"); so again, one ounce coins are all that's needed (plus, if they're .999 coins, you can easily split them in half if you would ever "need" to)

Gimmick all the way.

Foldable, now that's a benefit.