Print out the Lost Combination Form at the Master Lock website. Fill out the information on the form, including the lock's serial number, which is located on the back of the lock. Sign the form in front of a notary public and have him notarize the form.
Make a photocopy of the back of the lock. Make sure the serial number is legible. Also, hand write the serial number on the photocopy of the lock.
Mail the signed form and the photocopied back of the lock to:
Master Lock Warehouse
1600 W. La Quinta Road
Suite/WHSE # 1
Nogales, AZ 85621
Wait four to six weeks for the company to respond to your lost combination request with the combination of your Master Lock.