Technically, you might have an argument for reopening the divorce decree, but it's a long shot given the length of time and not an easy argument to make based on the facts you lay out. Further complicating this is the fact that if it's only "several thousand dollars" (meaning less than $10,000), you will easily eat through much/most of what you would recover in a best case scenario just on legal fees.
Situations like this are why it often costs more to not spend money on a competent attorney up front.
The above is not intended as legal advice for your specific situation or intended to create an attorney-client relationship. Talk to a lawyer for advice tailored to your specific needs.
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