“big jack’s jewels”

This mission doesn’t appear in any of the walk-throughs i have seen. I have finaly managed to get the gemstones, and i brought them back to base, rather than getting jaffs to do it. The problem is i can’t find any way to terminate the mission. There are two or three trades requesting uncut gemstones, all to independents, but the one i tried didn’t work. I also tried flying the crate out, and getting jaffs to pick it up, but that didn’t work either. Is there any particular reason for me to bother completing this mission?