So I've played around quite some bit for now ( sticking to my full virgin Iron Man runs) and one thing has been bugging my mind , there is an "artifact cache" that , when gone to , says "you find nothing , maybe you're missing something ?"  , and given how much stuff I've been taking along , I'd really like to know if anyone knows about what I could be missing on there... Please ?

Click on the scout button so that you are more aware of your surroundings. It helps to avoid traps and also to discover treasure caches. Level 5 scout is pretty safe or just up your perception.

you need to have 3 scout perception points when you go to that space. Note after landing on a space it will drop back down to your default so only scout up to 3 when you're next move is to the chest.

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.