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Are there any legal proceedings started for the family law matters?
He can sue you if he wishes. You cannot stop him from doing that.
But he is not going to succeed.
You have him more than enough chances to get the documents and in fact wanted him to do so. And he has even been back to your house on several occasions.
Those items were abandoned by him.
As well, his allegations are nonsense. You shredded the documents so there is no risk and he doesn't need the after 10 years.
I suggest you simply ignore him.