bluecloud33,
https://smallbusiness.chron.com/disqualified-dispositions-w2-income-terminated-employees-16755.html
says, yes, the W-2 should be corrected. However, you can continue your tax returns to the point just prior to e-file so that you know whether you will owe the IRS and/or your state and, if so, prepare extension form(s) with the amount(s) due should the company be slow or obstructive in making the correction.
Also, do read https://www.irs.gov/taxtopics/tc154 which gives the steps to take in getting a corrected W-2.
