It can't really happen, it wouldn't be a real note at least because Bitcoin works with addresses and private keys. You need to know the private key in order to be able to use the funds of the address. But if you print the private key onto the note anyone will be able to see it and to access the funds whenever they want. So the note would have to be very special using sophisticated mechanisms, most elaborated than current Bitcoin collectibles at least, otherwise it wouldn't be real Bitcoins, just some paper money you need to trust.
It is unrealistic idea because the core idea from Satoshi Nakamoto is with private keys, people will have their own Bitcoin banks.
Now, if there are entities like Collectible companies/ producers, central banks or commercial banks, to create private keys and release Bitcoin notes, it damages that core idea of Satoshi Nakamoto and it is very risky to use too.
The Collectible companies or banks will have private keys and they are actually owners of these coins, not anyone who have a Bitcoin note in hands.
Trust no one in Bitcoin (Coldkey story)