They look unused. I never thought of re-use, but I would assume that if you’re just opening a bottlecap without much care for preserving the cap (like when they sort of get bent down the middle) you’d be deforming it beyond re-use. It needs to be able to form a uniform seal around the bottle opening when capped and any bend will prevent that.

Never thought of trying out some bottle caps I tried not to damage when opening because they were pretty though.