Yeah so (in my experience) only 3 things happen if you come across an "Artifact Cache" thing 1 (most likely) you get nothing (what you're getting). Thing 2 you get Ice Cream (give it to the Golem, I think you need the Golem to tell you it likes Ice Cream for it to appear). Thing 3 you get a Hunger Charm (you lose Fullness slower, also can be sold). Do note I am not a Pateron so I have no idea if it's different in Story Mode.