My understanding is that all were once made in Taiwan.
More recently, I don't know the date, the AUS 8's from at least one of the large dealers are being made on the mainland. Could be just that one and it could be that some of the Taiwan models are older stock. I'll leave that to others that have the AUS8's to chime in. I don't have any myself with that blade.
That's what I've read on dealer sites, if you look closely on the spec's and it's also what I've found from the several I've purchased myself. I've never seen anyone claiming a legit D-2 version that came from the mainland.