My iMac computer was stolen from our church and the media team did not write down the pass code when they locked it and there is no apple store in our town for me to take the computer the closes one is 400 miles which Dallas texas how can I unlock it

If you can't unlock your Mac

After you locate your Mac, you can unlock it by entering the passcode that you created when you locked it with Find My.

If you can't remember that passcode, you have three options:

• Sign in to iCloud.com/find, then select your Mac from the Devices menu. Select Unlock and follow the steps to verify your identity.
• Unlock your Mac from your iPhone, iPad, iPod touch, or Apple Watch using your device passcode.
• Take your Mac to an Apple Authorized Service Provider along with your proof of purchase.

Hi,

You may have to factory reset your device. Try reading this: If your Mac is lost or stolen - Apple Support