Strictly speaking, the window you are mourning was never your door. The trade court has treated the collection of these duties as ministerial, not as a Customs decision, which puts the challenge in that court's residual jurisdiction rather than in protest and review. The hundred and eighty days would not have carried this claim even wide open.
So what runs against you is the two year clock, and it runs from accrual, not automatically from liquidation. Two class motions were argued last month, neither decided, and a putative class can suspend that clock for people who never filed. Ask about that before you pay anyone to go and fetch your own money. I teach treaties, I do not practise in that court. You read the phase notice correctly, which is more than most managed.
Read that twice at the bench this morning and it landed funny. Being told I might already be inside something I never joined is not nothing, but it does not help me price a job. Monday I still quote with the duty in the number or I eat it, and that does not change because a motion is sitting undecided somewhere.
What I can do without a lawyer is get my own house straight. Pull every entry, know which ones and what they cost, so if a claim form ever opens I am not starting from a shoebox. Evenings I have.
The rest I am not spending ten to fifteen on. An hour of somebody who actually practises in that court, to say whether a shop my size falls inside what they are asking for, that I would pay. You said plainly you do not, and I am taking it in that spirit. Still the first thing anybody has said this week that was not a closed door.