I lost combination to several old $5 Masterlocks. So I went to their web site. I found an amusing procedure.  The italics are Masterlock’s: I wonder how many prisoners are trying to use the web to unlock their prison cell doors…

Print out the Lost Combination Form from a printer friendly page, or download the PDF file.

Have your Lost Combination Form notarized by a Notary Public to prove that you are the owner of the lock (you can include up to 6 combinations on one notarized form).

Note: Inmates at a correctional facility – in addition to the lost combination form, you must submit your request on official prison letterhead. In lieu of notarization, the form must be signed by a prison official.

Photocopy the serial number on the back case of your combination lock. This copy MUST clearly show that the lock is not attached to anything. Be sure to hand write the serial number on the photocopy.