1) Did you test them with enough voltage? I know the original ones took a lot more voltage than the current crop of LEDs out there. I connected 2 to a keyboard controller for a Mame machine and they barely flickered when the lights were flashing, and actually made the controller erratic in flashing because I think they were pulling too many miliamps.
2) When you list to ebay, will you PLEASE be honest and state they have been "replaced with newer, <whatever specs> LEDs"? The arcade people wanting them for machines will likely need the old ones that could run off the amps/volts provided in a machine, and the Mame people will be better off with the newer ones with less amps/volt requirements.
Thanks

(Good idea though if they were totally burnt out.. can't even find the shells of them anywhere let alone lighted).