TurboTax does not have copies of W-2's, see the following on how to get a copy of your W-2.
Although you may have previously filed with us, we didn't save a copy of your W-2. If you used our mobile app to snap a picture of your W-2, it's not saved on your device.
Your best bet is to ask your employer or payroll department for another copy of your W-2.
Here are some more options: