Thanks guys. Well, I know it's buyer beware on eBay. I've already thrown out one Echoplex EP-3 that wasn't an EP-3 and stunk like someone peed on it. I still think (hope) this particular IIC+ is a rare amp that hardly ever comes up for sale, justifying my premium, and if I take it to Mesa along with my Tremoverb for a looksie, I'll get back a couple of amps that leave me no excuses as a player.
I spoke with the seller this am (before I was kindly notified of this thread), and I don't think he is the type to really mislead. I have his name, phone number, etc. He seems helpful. He probably just doesn't know.
BTW, he says this is Gil Ayan's old amp, and that since then it's primarily been owned by collectors, evidently the seller included. Perhaps Gil was the one that altered it?