there's a fixed encounter with 8 venom crabs in bayjin, so you should get a drop of one or three there with any luck.
i've had similar problems getting a shell from the monastary. but once, just once, i got venom crabs back at the original crash site. when i saw them from burz's, i ran and jumped off the broken rail into the wash that goes over the water fall. i was happy to take the damage in order to finish that quest!
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