In case anyone's looking for it the article has been taken down just temporarily while I sort something out. Sorry for any inconvenience.
Brian mentioned dozens of families he's interviewed, and I suspect Brian's experience is the norm - most of these documents have long since gone by the wayside, as the families haven't preserved copies of the depositions. However, as Sen's article indicates (and my own experience with the Lowe papers suggests), a few crewmen did preserve their own copies of the affidavits. Some of these have even come up for auction - Pitman's did, for example, as well as those Sen has noted. So there may be a few more out there.I hope those depositions turn up somewhere, but I think it's going to take quite a bit of digging around to do that if any of these documents still survive.