How to find out if land is leased

I have an oil and gas lease agreement that was my mothers, for a large amount of land

1292.68 acres in Pondera County,Mt. that was held by K2 up until 2004. She has passed away and when I called k2 I was told that they wanted to continue the lease, then refered to another department of theirs only to be told that they no longer wanted it.? What I am wondering, is there any way to find out if a lease is in place for this land as there are others that are involved with the property.

Thanks for any help, Chris

Hello, I am kinda new but I have learned that a lease has to be “recorded” in the county courthouse.