looks to be machined shut. hard to tell from those pictures though
if that's the case you are looking at impressioning or sighting the lock.
the blank you need is probably pundra (or y11, or n54g), bring the handle to a shop and ask to see if those blanks slide in, and buy a few of the cheapest one.
there are impressioning guides on this site.
i'll make an assumption that your lock has only 3 depths, there a good chance the cuts are
51513 highlight if you want to cheat
as for sighting, get a good light source and a small flat tool, like a lockpick with a broken-off end, leave the lock in it's normal position. looking into the lock you will see a certain amount of the wafer sticking up. if you see a lot of visible wafer, the cut is a 5, if you see almost none, it's a 1, if you see it halfway between it's a 3. put your broken pick in and push the wafers down one at a time to see the relative height differences between wafers and that will give you an idea of how the key will work.
this technique sort of requires a key machine and knowledge of the lock to use on its own, but as a supplement to impressioning it will make it a lot easier to find marks if you know what to expect.
does anybody know if there is a guide to sight-reading a lock on this site? i haven't seen one, but i'll make a proper one if nobody else has.
