Lock Box Gnomes
The Lock-Box Gnomes (possibly the mysterious Little Brothers ?) were a offshoot of an experimental project that had Splicer bodies delivered to reclamation points (so Little Sisters did not have to go out on the 'mean streets'). Hmmmm - Splicers are insane, so do you expect sane stories/rumors from them ?? Well it sounds a little more plausible than a body 'teleporting' on 'traumatic death' (might have been more believable if there ever was a remote monitoring device you had to carry with you... -- maybe there was a affiliated Plasmid required ?? ). The Corpse Gnomes would have a variation of the Teleport Plasmid (a psi type mind clouder, which protects them and explains why only mere glimpses are ever seen of them at work -- like when they leave those lockboxes behind where there once was a corpse you recently killed - nice of them to leave the stuff, when they could be trading the stuff to Splicers or whomever...).