Is the top off yet? I don't think bent wood cases were ever meant to be carried by the handle on top, certainly not longer distances. On each side of the base there is a cut out space for for hands to lift it. With a bit of effort you can get the lock open with a small size crochet pin, hook, screw driver, something like that. The correct keys can be found on the web, ebay, Helen Howes', etc. The side with the lock lifts right up when it's open (sort of hooks that slide and release the grip), the other side has a fixed metal bit you insert the according lid part into and move it a notch to the side. My 99K has a key with simanco number 96507, it's a 1934 bentwood model like yours.