Nah, just trying to dispel the OP's assertion that this is a Filco Ninja manufacturing defect of some kind.
I've identified four different states of Filco ringing/pinging:
1. No ping, just a dead click. (Sure, if you held it up to your ear you might hear a faint ping, but most people don't type that way.)
2. A very slight ping, quickly deadened. (1st-gen blues/browns.)
3. A more noticeable ping, quickly deadened. (1st-gen blacks.)
4. A loud, sustained RINGING, resounding through the metal plate. (2nd-gen browns, Ninja.)
Ripster, you don't have to keep repeating yourself and getting your knickers all twisted up. The more I think about it, the more it seems unlikely that many of the Filco Ninja keyboards have this problem - or there would've been lots more complaints by now. I probably just had some bad luck (x2).
BTW, I really can't hear much ringing in any of the samples posted so far. It's hard to record, I guess.