There is a total balance, for example $33,000.00 and total vestment of $21,500.00, how much will be awarded if due the time he worked there was only 20% vested?
The $33,000 is most likely made up of two separate accounts; one created by your ex-husbands contributions from his paycheck and one created by employer contributions. You are entitled to 100% of the employee contribution account (his deferrals into the account plus or minus change in investment value) and entitled to 20% of the employer contribution account (employer contributions plus or minus change in investment value). It is possible that your ex-husband created a 3rd account by rolling money into the 401k plan from an old 401k or from an IRA. If so then this account is 100% vested.
Hope this helps.