SALE IS FOR EMPTY TUBE - NOTHING INSIDE

I can easily say, the original mailing tube is rarer than the poster itself.

This is an original mailing tube sent directly from Nintendo Australia Marketing Team to retail stores to display and promote certain games

You can see it says

FROM: Nintendo AUSTRALIA

Date: 22/11/1999

Also with permanent marker it writes N64 Donkey Kong

There use to be Donkey Kong 64 in there, but I have sold those separately awhile ago. Just an empty tube

This is just more for historical purposes or if you have DK poster and want to be a completionist