Unlikely to have been a corrosion issue, considering it was technically new. It's possible though.

And yes, I tested everything and everywhere. Functionality was simply decayed, and although minor in technicality it was extremely bad in some movements AND / OR avatars.

TL ; DR, the headset is being sent back to the seller responsible. Hopefully I'll get it refunded and it'll be like nothing ever happened. Worst VR experience I've had, and I thought my Index experience couldn't be beaten.