Cleaning out the closet, I found 1 RIO CAR, still in the box with the manuals and power supply, I think never used.
Also found a empeg which I installed years ago and have since removed from my car. This one has a metal plate a riveted to the housing and obvious signs of use.

I assume they still work, but I didn't try and power them up.

I honestly have no idea what value these things have anymore, I can get pictures if anyone is interested. Otherwise I don't know what to do with them and will probably throw them out.

Located in Upstate NY, USA.