On a trip to Oman last year I visited the local markets. In a small stall in a back street a padlock caught my eye which I liked so much that I bought it so I could make a cache out of it when I returned to Australia.
To get to the log book you will have to work out how to open the padlock. There are three keys and you will have to use all of them in order to get the padlock to open.
Rules:
The three supplied keys are all that you need to open the padlock, no other tools are needed.
Cache is an ammo can, do not try to remove the internal container, it has been fixed in place.
If the key doesn't turn you are doing something wrong, please don't try to force it and break the key.
Once unlocked, the padlock wont spring open like other padlocks, you will have to physically open the padlock yourself.
Please replace every thing as found, remember there are three keys, don't lock any back within the internal container.