You're not understanding how comminging works here. Say I'm shady seller X, I'm sending in fakes to FBA (lol). Yes, I'd like to sell "Product Y." I'll list Pr

You're not understanding how comminging works here. Say I'm shady seller X, I'm sending in fakes to FBA (lol). Yes, I'd like to sell "Product Y." I'll list Product Y and enable "commingling," and send in fakes. Now when Amazon sells Product Y, Amazon will choose an item from it's shelves in a warehouse. Since shady seller X said "commingle my inventory" Amazon may choose the product(s) shady seller X's sent from it's shelves.