If your husband has his own business then a forensic accountant, as stated by Mr. Perez, would be helpful in order to determine where his income from the business is going. That however is an expensive venture. If he is a W-2 wage earner then records of his employer may be helpful to see if he is receiving cash under the table. These are always difficult cases to prove if a party is not forthcoming with income. Keep a look out for credit card bills, bank statments and other mailings to the home if he still lives with you.
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I agree with both Mr. Perez and Mr. D'Alessandro. A forensic accountant, often times a CPA, can assist you in investigating in the financial whereabouts of marital assets that may have been withheld and not fully disclosed by your former spouse during your divorce proceedings. As Mr. D'Alessandro has stated hiring a forensic accountant can be costly should you choose to pursue that route.
A common issue in divorces.
It's also too technical and fact sensitive to really tackle here. Your attorney (or you if acting pro se) can issue subpoenas for bank records and credit card statements; that's usually a better start than jumping to the expense of a forensic accountant, which can be substantial (often requiring initial retainers of $5,000-$7,500 to get started). If the preliminary discovery that's conducted leads to more questions than it answers, THEN I'd look into a forensic accountant.
IF YOU LIKE THIS ANSWER AND APPRECIATE THE TIME IT TOOK TO WRITE IT, PLEASE SELECT IT AS "BEST ANSWER." Thanks. The above is said without seeing your case file and without my understanding the entirety of the facts of your case. Depending on those facts, the above information be may incomplete or may be completely inaccurate. The above is intended as general information only based on what you described and not as legal advice. I advise you to consult with counsel who may be able to provide better information commensurate with a better understanding of your situation.