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This question is about employer.
No, employee contributions to a 401k are not reported on a W2. That deduction is taken by the company, and they should report those on their own tax forms. Your tax forms should focus solely on your own contributions.
You should report any elective deferrals in box 12 of your W2. Box 12 basically covers miscellaneous forms of income that must be reported to the IRS. This could include uncollected taxes, and specifically, in D, this includes those elective deferrals for a 401k cash or deferred arrangement.

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