How do I get the hidden safe open

Hint 1 of 13:

Did you get the small box from the safe in the bank?

Hint 2 of 13:

"EXAMINE Little box"

Hint 3 of 13:

You need to use the Safe Cracking box on the safe

Hint 4 of 13:

"USE Little box on safe door"

Hint 5 of 13:

"OPERATE Validation button" on Little box