I found a dupe glitch due to how the smart chest links and the "backpack" system
Basically if a item is in a smart chest and you break it if its the only one placed down
It stays in your inv
The issue is, if you place a new smart chest (same color), it has the items inside of it
And if you take out the items, the one inside of your inv, does not update at all
Meaning if you repeat this
Place smart chest 2, Take items out of 2, Break smart chest 2
Infinite items