The best caches in Kingdom Come Deliverance make it possible to progress very quickly in the game and therefore to go faster in the main quest. Some caches are filling up again and are by consequent very interesting.
This is the case of the chest in the first room which juxtaposes the foreman’s workshop at the Monastery near Sasau.
It is full of swords, helmets, chalices, books.
Otherwise, you have to aim for the treasures. There are treasure maps that tell where they are located but vaguely. You can easily find the exact places on the Internet, it will save you days of play to keep seeking.