A personal property lock assembly mountable to a vehicle may comprise a cable lock, a protrusion with a plateaued surface of a lockbox, a mount coupler comprising a seating surface to seat against the plateaued surface and a mounting mechanism, and a fastener. The lock assembly may comprise one or more locking mechanisms to provide securement to a cable lock that is anchored to a vehicle by way of a coupler. The lock assembly further comprises a cable reel assembly and a cable receiving mechanism operable together to retractably store and allow extension of a length of a cable. A cable locking mechanism removably binds and locks an end portion of the cable operably inserted in the cable receiving mechanism. As referenced herein, various mount couplers are effective for binding the cable lockbox to respective vehicles, which may also be disclosed with alternative embodiments.