He should have to help you with shipping ?!?
I think not ... IMO he shouldnt of shipped it with fluid, but he must of had it sealed right so it did not leak, when you took it out something must of changed. I have no idea who takes a converter out of a box and cant tell it has fluid in it ?! you should of checked and drained it before shipping it. So really in theory he shipped it with it shame on him, but he shipped it so it wouldnt leak thumbs up for him. You shipped it with fluid and did not make sure it wouldnt leak .. shame on you. Plus no matter what the fact is, if he of got the right parts from the start none of this would be going on anyways .. so your at fault for that, so shipping is ALL on you.