None of us really knows what's going to work in a SHTF scenario. Though it's looking more likely we will find out.
Barter of different sorts is a guarantee. There was a fellow, can't recall his name - he used to get posted a lot on Zero Hedge - who lived through the Bosnian war and he had some interesting observations about what people did to survive.
Barter. Women were prostituting for toilet paper. Disposable butane lighters were a useful trade.
A key thing to keep in mind is that if/when the USA goes Venezuela, there will be no USA to bring us aid. There will be no one to bring us aid. We are the ones that always brought the aid to others. It will be unprecedented.
Smaller weights of silver/precious metals, regardless of form, would seem to count for the same as long as they can be verified to be .999 pure. Who knows? We will know when it happens.
The most valuable commodity in Bosnia during the wars there were fourteen year old daughters.
Think about that when you dream about SHTF.