Several users have noted it now says "made in Canada" on the 1 lb. plastic bottles.
As has been discussed here in the past, the Australian manufactured IMR 4227 was suspected to be H4227 with graphite added. Several Australian members here have confirmed the ADI made and numbered 4227 (different number but I don't remember what) also had graphite added, which made the "switch" of H for IMR a suspected event.