I think "most" employers in this case would add an entry to box 14 of the W-2; however, most entries in Box 14 are just informational and would not affect the tax return (as it shouldn't if the employer has already removed the 401(a) contributions from Box 1 as dmertz said).
But since the entry in Box 14 would not affect the return, the employer can leave it out without hurting the taxpayer. The W-2 Instructions don't appear to require it.
@willitsfire
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