Differing amounts in boxes 12, 16, and 17 for same W2

I'm not sure what you mean by "the multiple Filing and Reference Copy." The employee's copy of a standard W-2 has Copy B to attach to your federal tax return if you file by mail, Copy C for you to keep for your records, and Copy 2 to attach to your state tax return if you file by mail.

Are you saying that on the W-2 that you received from your employer the amounts in certain boxes are not the same on all copies of the W-2? If the copies don't all have the same amounts in boxes 1 through 14 the W-2 is not filled out correctly. You should ask the employer for a corrected W-2.

However, boxes 16 and 17 could be different for different states. Do the different copies have a different state in box 15? If so, it's normal for boxes 16 and 17 to be different for different states. If you lived in one state and worked in a different state, you could have separate state information in boxes 15, 16, and 17 for each state.

Not clear if you actually have more than one physical W-2 from the same employer. If the Employer EIN is the same on all copies, then I would expect only one of them to have the "corrected" box checked. If thats the case, then that is the only one you file.