I agree, there's something curious about the electronics. The seller added this, the 2 quick tone change switches were disconnected by the factory as per the original owners request. And from the original text, the electronics are custom straight from the factory with volume, high, low, and pan controls as well as two quick tone change switches. Note that the build sheet does not say anything about the electronics being custom. Here's a close up of the pic in the listing; two of the knobs don't look stock.
Given that two of the knobs are not original and that the two quick change switches don't work, I'm guessing the electronics have been compromised.