I bought it used, as a "outlet" piece, one which a previous customer has returned for whatever reason. What probably happened was, it was missing a controller, and the store just put one of their current HTC Vive Controllers in it, as the V1 are not for sale any longer. Guessing they never cared to even test it's compatibility with the headset.
Either way, I returned the HTC Vive back to the store.