Showing up with rolls of silver advertises that you have a stockpile to be robbed.
Showing up with a small handful of old coins that your mother or grandmother left you, and saying as much with tears in your eyes, doesn't make you much of a target.
Wedding bands are another method. Get plain gold bands, preferably in your size, as close to spot-price as you can find. If people see you pull the wedding ring off your finger and use it to barter with, you look like just another desperate person. Nobody needs to know you’ve got 3 more in your pocket.
If you can get a bunch of gold wedding rings for not too much over their gold price, that would be good in a barter economy.
When the guy you’re buying from thinks your down to selling your wedding ring, he’s not as likely to try following you home.