In reply to timbers:
Most combi locks can only be reset when the correct code has been put in.
I found the combination for a three-digit lock a few years ago by just cycling through combinations until I found it. A thousand combinations should take about an hour and you'll probably find it before that. Sit down in front of the telly and your brain will do the "change-check-change-check" process on automatic after a while. Be methodical and start at 111.
Stewie