Won't subtract in boolean

I have an .stl file that I am trying to subtract a box from. When I put them in the boolean they both disappear. Also, wont' let me attach the .jas file in this thread???
 
* Compress the .jas to produce a .zip.
* Attach
* Also: Check if waterproof, ie if it is a closed mesh
 
:) Thank you, ZooHead, for the help!
:mad: Whoever produced the .stl file is, clearly, not quite watertight.
 
Probably he got the stl somewhere else, so nobody here is offended (hopefully).

But I'd subscribe to "whoever programmed that export feature in whatever CAD-Software wasn't quite wathertight" :) ;)
 
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