Check out sritips on Youtube to see how to convert lower grade silver to .999 fine. If you have enough to convert, it might be worth the effort.
It is not a casual undertaking to refine silver. Nitric acid and the NO2 fumes it produces are no joke. The acid can blind you with a splash on your face, and the fumes can destroy your lungs in seconds. Unless you have many many kilograms of silver to refine, the cost of a fume Hood and the personal protective gear and the flasks, Etc make up for what you are going to lose selling junk silver. Plus, junk silver is an assayed form. You’re No Name Bar of silver is not. No way am I going to have nitric acid around without a dedicated place to use it in a fume Hood.
Sreetips is the spelling.
The only problem I see, if I was to go to that much effort, is that a dealer would be unlikely to accept it as “pure” and offer a decent price.