Interestingly, the folks who contacted me call this their logo, and it has been for some time.
The file, however, has been "lost" which leads me to believe that they just went "net fishing", even if a few years ago, but who knows?
I actually plan on getting them away from the button look to make my job easier, and now, also, to reduce my problem of wondering if this is really theirs.
Even if I can't get in trouble, I often also strive to not be an "enabler".