the big problem is wrongful accusation of ownership. What I would do is not at all what I'd want to do, given my attitude about the (IMO) foolishness of the War On Some Drugs.
I have the advantage of having known our resident deputy for nearly twenty years. So, I'd give him a call, avoiding 911, and let him know what I'd found.
I'd rather find out whether the "perps" were strangers or were folks I know. Strangers? Politely, "Go elsewhere." Folks I know? "Go elsewhere." But I'd give a lecture about the hazard to which they had put me, given the nature of today's world of the War on Drugs. "Don't insult me, don't put me at risk."
Back a number of years ago, one of our deputies back-trailed a burro train, knowing the smugglers had already made their drop. He came to a road that runs along my west boundary line. On a hunch he stopped at the edge of a fairly steep slope and walked around to look in a ravine. The ravine ended against the road. He found a small cave; in it weree 200 kilos of Sweet Grass. While we all knew who owned it, the joke around the community was whether it was my Goodies or did it belong to the Acostas, the smugglers. (If you run across the book "Drug Lord" by Terence Pappa, it's worth the read. The Drug Lord, Pablo Acosta, was a nephew of my neighbor.)
It helps to know your LEOs...
, Art