Today I asked,

...why are those TYHJF shares already trading by "certain" people under the pink sheet symbol.

TD Ameritrade answered,

.... In regards to your question about this security and any recent trading activity that may have occurred under the new symbol, please understand, although our firm typically uses DTC as a domestic depository, there are other depositories, aside from DTC, that a brokerage firm may have held their shares with that could account for recent trading activity.