perhaps a depressing thought to folks, but given that everyone here agrees that these guys come into the U.S. rarely and are rarely in collections alive, imagine how rarely they are in museum collections. In many cases, we cannot get collecting permits for where these animals are native due to all kinds of political issues. It would be ideal if we could (fewer specimens collected, and they'd have locality data), but we cannot. So, for most of these taxa we are reliant upon the exotic pet import trade.
So... what I am wondering is this: what do folks do with their rarely imported salamanders when they die? A loss on one side of this coin could be at least lessened if the specimen could be made available to researchers via a museum.