The Oklahoma County Sheriff's Office (OCSO) Bomb Squad safely retrieved grenades after a person walked into the Bethany Fire Department with the devices.
Authorities said the person said the devices had belonged to a deceased relative and wanted to get rid of them.
The bomb squad found that one of the devices was a live explosive and the other was inert, or harmless.
Experts said they will dispose of them.
Authorities reminded members of the public to call 911 if you believe a device has the capacity to explode and to not touch it.