missing locality name, box 20. need help to finish filing taxes

Missing locality name, box 20. Box 18 is filled but box 19 is empty. This is from a sperate W2 i received corresponding to a settlement from a lawsuit involving my employer. It's literally chump change but turbotax won't let me finish e-filing unless i fill out box 20. I wouldn't necessary say it falls under my employer because the "employer name" listed on this W2 is the name "defendant V employer", following by the address and zipcode in MN, but i live and work in CA the whole time and never MN. It came attach with a check. There's no contact information besides 2 phone number that's only intended to be used for change of address or contacting them after check void date. I haven't call any number and turbotax won't let me leave it empty as it's also empty on the hard copy. I can't just contact my employer for the info since this isn't your typical employer w2 form. I'm at a lost. What do? Enter "not applicable" in box 20, or file my federal tax through mail and attach that w2 along with it?