Navy missiles go missing all the time - there’s no system in place to account for any ordnance at all. Sometimes the Safe/Arm switches mysteriously arm themselves on warshots. Navy missiles are also semi-active.
Actually every dropped or launched ordnance is accounted for by type and serial numbers and many air launched missiles also require flight time be logged and if there’s an active seeker that seeker on time is also logged due to maintenance requirements.
Navy missiles are semi active? Navy has semi active, active and passive systems.