What do you mean it "showed up out of nowhere"?
YOU are supposed to know where you worked and keep track of how many W2s you're supposed to get.
This is YOUR LIFE numbnuts.
It is YOUR duty to take care of it,
Jack will charge you again, but you don't have to go there.
go to an IRS VITA site and get your 1040X done for free.
http://www.irs.gov/individuals/article/0,,id=107626,00.html
AND MAKE SURE YOU HAVE YOUR **** TOGETHER FIRST.
Go to the IRS WEBSITE.
Read the 1040, 1040X, and their instructions,
Yes, YOU.
irs.gov