I use them when I have them. Had some prepped OF brass put away in 100 rd MTM boxes with silica gel packets on top, after two years they're still nice and shiny. I can't say they made a whole lot of difference, I only used them because I had them; I was hoping the brass wouldn't oxidize and it didn't.
I wouldn't go far out of my way to do it but if you have the packets why not?
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