Adding used condition

I have a bunch of used control boards. They are available on Amazon both oem and generic. They’re all sold new and used except my version. It’s only sold new. Mine are oem, in good shape, and I’m ungated in the brand. There’s no reason why it can’t be sold used. Can I have Amazon add the used condition or could I make a new Asin that’s used but a 2 pack? If its going to be a big issue I’ll just sell them on eBay.