Keys

By getting a trial key and combining it with 8 gold ingots/nuggets then you will get a unbinded key, to bind a key you sneak click on a trapped chest, now, by holding the key and opening the trapped chest you can open the secret vault that has less inventory space, but can only be accessed by breaking the chest or using the key. the chest still functions like a normal chest, nobody can see the vault and the chest keeps all it’s inventory space it just has that secret vault within it.