When I looked at your original question it seemed that this was threatened cross border collection. Which meant that the states had to have a cross border collection agreement or that your state would have to honor the states warrant trying to collect. Which is what I said.
Now, there has been a seizure and collection demand or negotiations.
While a review of your case is certainly worth the price I asked, I will help for the price of an Answer.
Look up his work records, and evaluate the claim from the other state.
And, as far as the collection negotiations, since he isn't working, do nothing. There isn't any wage income to pursue, and you don't report any unemployment income.
Without an income, they can't collect anything, and that will give the time you need to look into things further.
Thanks again for using just answer. Positive feedback is appreciated. I'm PDtax.