Temporarily unaware of position...
My civilian and RAF logbooks were both 'lost' when I was chopped in the late 80s and needed CI to countersign military hrs in civvy logbook. Post room at Biggin didn't send registered. They must've been gathering dust somewhere as, along with my jaw, they dropped on the doormat some 12 years later and 6 years after I left the mob - all signed and stamped up !
Perhaps lost books gravitate towards a darkened room in the personnel management centre ?
Good hunting.