Abstract: A portable and removable security container assembly and a method of its use are described. The assembly includes a docking bracket that is secured permanently to a substrate surface in either a motor vehicle or a building, and a lock-box or safe. The safe has a housing that has at least two cavities or compartments, in one of which is situated a locking mechanism of a latching assembly. The safe is adopted to engage with the docking bracket and fastened in place by means of the locking mechanism. The control for the latching assembly is accessible and activated only from within the safe. When the safe is placed in the docking bracket, the locking mechanism is aligned with engagement elements of the docking bracket. The latch assembly includes a rotatable carousel centered on a hub that a user can turned by a switch handle.