Your best option is to find an attorney and file for the divorce yourself. He does not need to agree to the timing, and the more opportunity you give him to hide his assets the more difficulty you will eventually have in uncovering them. Do not wait until he is ready!
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You need to hire an attorney to discuss your rights. During the process of divorce, you can request what's called "discovery" and specifically ask for these records. He will be required to turn over the documents. With that amount of money at stake, I would speak to an attorney sooner rather than later.
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