He has documentation from GM of Canada Vintage Vehicle Services for this specific car. There are almost 3 pages worth of options listed for the car. In the documentation, it states that this car was a "1 of 1" for GP sales in Canada in 1980.
Which, all comes down to its worth to you.
It's a smog era 1980 Grand Prix. We're not talking an AAR Cuda, and, it'll never hit that territory either. It was a 17.1 sec 1/4 mile car. Other GPs of the gbody era were faster. Other gbodies were faster. No special edition appearance pkg. Nothing to really stand out. Not like a 2+2, 442, SS, GN, ChooChoo, etc.
A couple years ago there was a service all-car or all-par or whatever, it broke down how many of how many cars there were and by the time you took a 1990s buick pedestrian car and clicked enough options it went down to 1 of xx cars like it.
Who knows, maybe the 1 of 1 optioned like that accounts for a floor mat or pin stripe factored in that not many other guys clicked with those options.
Pontiac Historical Services always kept great records and you could order info packets. Sounds like that's what this owner did, or, one in the chain of ownership.
All that said, I'll probably stick to my original position. It's a nice piece of trivia, but, isn't the type of thing to add much in terms of value.
We've hit the conversation before on other strangely optioned gbodies. Rare doesn't always equal valuable, and, valuable doesn't always equal rare.
But if that bragging right has some extra value for you, go for it, just don't count on getting that same premium back out easily if ever