Yeah, I think this is the press mask you're talking about
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I'm also fairly sure that's one of the two mask designs that was given at the PAX after-party.
The other mask design is the one I was trying to buy, and it is indeed a 1 of 1. The guy wanted too much money though.
I sadly can't find a picture of the mask that I was trying to buy. I neglected to save it.
Oh, and yes, I do have one of the rubber Corvo masks that isn't all that rare. Though at one point, the rubber mask alone was selling for hundreds of bucks. I had two and sold one for like $200 I believe. Not bad for something that was a total freebie.