As mentioned there are combination locks that contain a compartment - i.e. http://www.armstronglock.com/product_info.php?products_id=172 http://www.armstrongloc

As mentioned there are combination locks that contain a compartment - i.e. http://www.armstronglock.com/product_info.php?products_id=172 http://www.armstronglock.com/product_info.php?products_id=17... While in this case perhaps it wouldn't be to 'check it out' but certainly post purchase or whatever requirements needed to exist prior to getting the combination. It is subtle enough to blend in to an urban landscape where abandoned(?) locks on chains aren't all that out of the norm.