My employer will not issue me a check for money he took for a 401 plan that is no longer active. what can I do
You are required to write her or him a formal letter making a request on the owed amount. Make a copy of the letter before submitting it. If there is no effective response, you can use the assistance of an advocate to get legal help on this.
Lawyer up if you don't get satisfaction.
He's still employed there, so he is not entitled to a payout unless his employment status changes or he wishes to roll it over into another 401. His wife already checked on it.