Just throwing in my 2 cents on this, which may not be helpful in the least.
I've got two or three pieces of what I think is the same kind of wood myself. I salvaged mine from a shipping pallet that was partly made from it.
The pieces I have are very heavy and waxey. The weight seems to be similar to hard maple, rosewood or purpleheart. I have no clue as to what it is. It does seem to be hard enough to use for a fretboard and that's what I'm planning to use it for. I live in east Tennessee and that's where I found the pallet. I don't know how likely it would be to have a shipping pallet made partly from an imported wood. It would seem unlikely to me, but I can't claim to know anything about the pallet making industry. As best I can recall, the remainder of the pallet was of something common, poplar, pine or soft maple. I salvaged the wood something like 3-5 years ago.
Good to know I'm not the only one scratching his head about this stuff.