Stumbled across a cache

[Lightspeed]

I'd show some respect to the owner, advising him that there was a light on in the barn before you entered.

I'd not tell him I'd been in there. I'd not take anything at all. But I'd remember the location and would chat with the owner to try and work out what he's about.

Before SHTF liberating stuff from someone else's cache, especially if its in a private building, is immoral and is also theft. Don't do it.

After a collapse, stealing that cache may become a necessity, but assume that any serious prepper will have taken measured to protect it in some way, when risk assessing the plan to do so. Also bear in mind that taking a surviving prepper's cache post SHTF could be handing a death sentence to him and his group. Not something to be done lightly.