NYT on the script:
It’s not clear when David wrote it, but this version is labeled a second draft and dated May 3, 1983 — years before he helped create “Seinfeld” and, later, “Curb Your Enthusiasm.”
...
a 24-year-old Redditor from Rochester, N.Y., had found the eBay listing through a Google search. It had been put up for sale by an account offering several unpublished scripts; it was not clear how the account obtains them, and its operator declined to comment.
The article includes a photo of David with Michael Richards in 1981.