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Wondering if anyone hit Ebay Authenticity Guarantee items how would a DNA or PEB play out any info share below

IS method is the best for ebay but you'll be hitting actual people if you care about the morality of that and your opsec will have to be good as they will most likely try to go after you.

What's IS method? Can't do it with companies on ebay?

Item Swap, have no anecdotes on usage with companies so I can't say much on that.