Yes, it seems I wasn’t clear enough.
What I meant is that you can disable the collision of the box that is being held. Then reenable its collision after you let it go.
The easiest way to do this is to create a basic box blueprint, retrieve the specific instance of the box, and adjust the collision settings of that instance:
Then when you decide to place it back down, you reenable the collision of that object.
However, make sure your basic blueprint box settings are like this:
Where you add a BOX COLLISION that is slightly larger than the box, and that the collision will only interact with whatever object type your character is. (Usually this is PAWN).