Pretty crazy to me that this has never made it to the supreme court. Is there some reason for that? Is someone blocking it?

I think it will, with IJ sponsoring lawsuits, in addition to the the Beverly Hills FBI fiasco. The deal is that many agencies only do civil asset forfeiture with game theory in mind. They will only take $10k , because it would be a Pyrric victory to win in court, since the lawsuit would cost you more than $10k. They also play games where they'll give you back the money if you're angry enough to sue them anyway, then you no longer have a case and you can't continue your suit. Give IJ $20. I think they have a chance of getting it done.