Paul wrote that All the fullness of the Godhead (every bit of it) dwelled in Jesus in physical form. One cannot steal what one already owns. One’s own identity, cannot be considered stolen property.
In the beginning was the Word, and the Word was with God, and the Word was God. This is not something Jesus acquired at some point in his existence. It is simply who he is. Paul wrote that all the fullness (the absolute entirety) of the Godhead resides in Jesus in physical form.