Even if someone destroyes your endewr chest if you make another one your stuff will still be there. You can carry and ender chest into the nether, sit it down, place items in the chest, pick the chest up, fall in lava die and lose everything and your stuff will still be in the chest. So if you already had one at your base or make one your stuff will be there.
No one else but you can use what YOU place in the Ender Chest.
There's not even a way to allow other access to what you have in there.
Jesus is Lord!
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