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My advice is this. Make your life simple. Report the plates as stolen now. Pay the $87 and be done with it, stress and all.
No need to open a big mess at (respectfully) your age. Better things to do.
I hope this helps.
This is kind of a guess, but I would suggest just riding it out. You may well be in the clear with nothing to worry about. You might try calling them to see if any additional violations are pending on that plate. If none, you are in the clear. If there are, you ought to be able to assess the situation and decide what to do.