Did the casino withhold both federal and OK state taxes from your winnings?
Hello again dib,
Either way, you should file a nonresident return with the state of OK, even if OK state taxes were withheld from your winnings. It is possible you may be due at least a partial refund depending on how much they withheld.
When you file the nonresident OK return, the taxes you report paying on that return can then be claimed as part of your federal itemized deductions (assuming that you itemize). If you only use the standard federal deduction then you would not be able to claim the OK taxes as an additional deduction on your federal return.
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Thank you dib