Interesting topic. Stirred up some cobwebs in the way-back machine.
As a retired dealer/speaker nerd, all of the source components, cables, and amplification in my system are discarded demo gear, and rep samples. "Hey, Mr. EAT rep: That's a nice turntable. When it's done making the rounds in the territory, send it my way." So, technically, ALL used. With a full factory warranty.
On the other hand, I designed and built my own speakers from 100% new parts -- raw drivers, caps, coils, etc.. After 35 years they are well past the "gently used" classification, and solidly "used/vintage."
Thanks for the topic.