CN: I had a similar problem a few years ago with stock also purchased thru payroll withholding many years before; I didn't even know I still had the stock until the company sent me a letter telling me I had to sell the stock to them as a private venture company had bought all the stock and were taking the company private again. I couldn't find exact records of my purchase, so I 'guesstimated' and submitted the tax return... I figure if I didn't know the gov't probably didn't either... and if they did, worst case I'd have to pay some more tax (or get more back?)..