Staff Buried Mystery Box Lock (Leroy)

[Luckyy]

Steps:​

1. Free Leroy from his cell.
2. Obtain candy from the Candy Shop.
3. Bring Leroy to the Mystery Box location you want to keep.
4. Stand near the Mystery Box with Leroy facing it.
5. Give Leroy the candy.
6. Leroy will hit the Mystery Box, locking it in that location.

Result:
The Mystery Box will remain at that location instead of moving after being used.