This item is available from the My Nintendo Store (in select locations) for 30 Platinum Points, so you can "print it out and slip it in your Paper Mario: The Thousand-Year Door game case" when you get the Switch release.
"Unleash those retro vibes with this alternate cover featuring artwork from the original Nintendo GameCube™ system release."
The Nintendo New York Store is also giving out a special GameCube slip cover when you purchase the game there:
And if this wasn't already enough, Nintendo is also offering a special themed notepad on the My Nintendo Store that's available for 550 Platinum Points. Here's a look and a bit about it:
"Take notes in style with this colorful My Nintendo papercraft reward. This notepad features colorful characters from the Paper Mario™: The Thousand-Year Door game. Each notepad includes 20 different designs on 60 total pages. A paper airplane and folding instructions are included with this reward! This physical reward is available while supplies last."