Your first step should be to check whether the refund appears on the Oklahoma unclaimed property list. I have provided a link to the web page.
Is there any possibility that you notified the state of the lost check and a replacement was issued?
You should confirm the information you received from the unclaimed property office by checking on the web site.
If the amount doesn't show up, you should write the tax commission, include a copy of the check and send the letter using certified or registered mail, making sure you get a receipt for proof of mailing. This way they will need to respond, but it may take awhile.
Thank you for your help. Having worked for a teaching hospital as a trauma nurse for several years, I am well acquainted with the government time frames. I will follow your instructions.
Again, thank you very much,