In the 0.25.4 PTS update, they made it so we can no longer put construct keys into packages to delete them. Before packages, this was the same. What I see wrong with construct keys not being delete-able is the following:
-Construct keys cannot be consumed by the person who made the construct key
-Construct keys cannot be deleted once they are expired
-Construct keys are not consumable once expired
What this means, is that players can create an item that they can never destroy, unle