The company who began the claim withdrew it - I believe they came to see that there was no real case...!
I understand your concern, but I don't think there's really any need to worry unless a cache is placed in an obviously dangerous location with no suitable warning on the page.
Geocaching.com cache listing pages all link to gc.com's disclaimer, which says amongst other things, "Cache seekers assume all risks involved in seeking a cache".
Do not go gentle into that good night.
Rage, rage against the dying of the light. (Dylan Thomas)