Box 14 is not standardized and does not require your employer to report specific information. Reporting RSUs here is common but not required. It is possible that the additional wages and taxes withheld are reported on your W-2 as they should be without an amount appearing in Box 14. If you are not sure if the RSUs are included in your wages or if the taxes being withheld are reported, you can check with the issuer of your W-2. You can also compare the wages and taxes withheld to a recent pay stub or see if you received a pay stub on the date that your RSUs vested.
