Employee and Employer Contributions
401(k) plans include both employee deferrals (what the participant contributes from their paycheck) and employer contributions (such as company matches). In divorce, both are subject to division, but the employer portion is often subject to a vesting schedule—which means some parts of it may not yet belong to the employee and thus may not be divisible.
A well-drafted QDRO for the United Envelope, LLC 401(k) Plan will distinguish between vested and non-vested amounts at the time of divorce. The alternate payee (usually the non-employee spouse) typically has rights only to the vested portion unless otherwise agreed to in the divorce terms.

