these are quite popular and i have been able to open a few through 'manipulation' if you will like to call it.
However i came across one the other day which may be of interest. What many people don't realise about unicans is that by pusing a button causes 'two' clicks or internal motions. Hence it is possible to set the lock on 'half' numbers or slight indents of the button. So it is prudent to try half button pushes if someone has a malfunction of the lock.
Also it is common for the cogs to get out of alignment and cause a malfunction - there is no repairing of the lock when this happens just buy a internal lock - they just keep on breaking down regardless of what you think.
Manipulation is easy enough as the little L shapped foots that engage into the cogs of the locking mechinism are already lined up ready to go in as it where. Thus if a button is not a number the foot is not lined up. By putting slight pressure on the knob you can 'feel' the difference between one lined up and one not. One lined up is generally any easy push quite and quite smooth - one that is not a button is quite hard and rough to push. From there you have to play around a little with combos etc.