The answer to the impossible riddle

The prisoner goes to the box with their number. If their number is there, they get out and let the next person go in. If their number isn’t there, they have to go to the box which has the number on the palate they found. Keep doing this till they find their number.

Ex: Prisoner 1 goes to box 1. He finds paper 8. He goes to box 8. He finds paper 48. He goes to box 48. And so on until his 40 tries are up or when he finds his paper.

There is about a 33% chance of them succeeding.