W-2 with Amount in Box 16 But Box 1 is Empty

Sorry this is complicated, I'd appreciate any help you can give.  We received 3 different w-2s from the same company for the same work.  The checks were for residuals earned from acting work done in CA five years ago.

 

CA w-2:   shows state tax on the TOTAL amount earned in the checks.  There is nothing in box 1, only box 16 &17.    

 

NV w-2:   is for our state of residency, where we have received ALL of the checks.  It shows half the total amount of the CA w-2 in box 16 for NV, and boxes 1-6 show taxes withheld on the TOTAL amount.  

 

IL w-2 : was from a few checks that were sent to a former address in an error by the company.  The amount in box 16 is the other half of the CA w-2 total (the CA total was seemingly split between the NV and IL w-2s), and it shows IL in box 15. There is nothing in any other boxes on the IL w-2, including box 1.  We did not live in IL during the time of the work, nor have we had residency there in the past 2 years. The checks were accidentally sent there and later forwarded to us by USPS.  

 

I've tried multiple times to find contact info for the company that issued the w-2, but can't find any info other than a PO Box.  I don't know how to handle a w-2 for a state that is both non-resident and not the state the income was made in (IL) and has no info other than in box 15 & 16.

 

How would you proceed?  

 

Thank you!