They should be OK - are they on ADP (or similar) stationery? In either case, check the paragraph I suggested in the link I posted.
I would never, ever recommend using the W2. In the first instance, you're out of the 15 month window of being able to claim for 1/1/08 to 31/12/08. But more importantly, Paragraph 139 says that the two pieces of evidence must clearly support each other. As your deposits are net of pension, medical, and other deductions, and the W2 only shows gross and state and federal deductions, they aren't going to add up.