Near to Severograd. Next to a bus station (idk sure the place, but i was coming from Gvodzno if i dont remember bad. The door on that shack was not showing any prompt, just like a wall, and i went next to the can i saw inside but on the other side on the wall and managed to take it up. Maybe that could lead to some problem on the future if base building is added, so I decided i to post this, have a nice day and see ya soon!