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Thanks jeffmoss26. So if that's a Bommer Letter Box Lock, is that a representative example of ''letter box locks''? Is that what they are?

I have found an example of what they consider a letterbox lock in reference to these tension tools.
http://www.nothingbutlocks.com/Lowe-Fletcher-2831-Springbolt-Locker-Lock-p/lowe%20and%20fletcher%202831.htm#axzz4MomniIly

These locks were often used in drawers or old cabinets before cam locks became popular.
Usually the nose is longer to fit through the door or drawer front and that is why there are different length wrenches.
To work the levers you can use a piece of piano wire or a flag shaped pick or a pick that many think is useless - and it pretty much is for tumbler locks.
This is the very long hook called the postal hook. Get it "postal hook" - "letterbox lock."
Of course real post office locks would be if better quality and may require more specialized tools.
I don't know if it's still true but 35 years ago Belsaw's course included a section on picking and keying these locks. It was a good introduction to working with "real" lever locks in the future.

I hope this helps someone and that it all comes through all right. This is my first post on keypicking.

Herw's an example of a letterbox lock.
http://www.giahardware.com/Bommer_25389 ... /25389.htm

Yes I don't recall ever seeing lever padlocks being sold in the US in the last 50 years except Master (of course) had a stamped steel one with two spring levers going directly to the shackle. These could be opened with any wire. Other than furniture locks the only place I can see them being used is safety deposit locks etc. Has anyone else seen any?