Here are the pictures, posted on behalf of Lloyd.



Very interesting, thanks for sending me the pictures. Feel free to send the metal ones too if you want.
I'll make a wild guess: these are simple warded locks. An L shaped piece of wire should be enough to turn the bolt.
Do you have the key? If so, what happens if you insert it and turn?
Are you able to move the bolt a little with your fingers?
From the first two pictures looks like the 4 big nails are keeping in place a wooden plate which covers the back of the lock.
You might try to gently pull out the nails and see if there's something broken inside one of your locks.
Cheers
