Also, in case we don't want to pay some rando $1200, someone from ETS could reach out to Carson's studio (phone number is right there in the picture, if it still works all these years later) and just tell them about this unofficial sale of his work. Maybe he'll just donate the footage to us?

Although I met him at a gallery in New York years ago and he's a prickly bastard, he could just have the thing taken off of Ebay.
Could be risky.