It is even possible to use different crates (filled with different Items) with one type of Key
I started 3 crates, named "Material" , "MaterialHOLZ" and "MaterialSTEIN".
Put different types of wood, leaves and saplings in the "MaterialHOLZ".
Put diferrent types of stone (from fw, nether and end) in the "MaterialSTEIN".
and changed in the 'config.yml' the Key to "Material" at the two other crates.
A nice way to let the player decide, what he needs more.
[Sorry, german thoughts in english words]