What does an hour mean in the Log Book
A check Capt riding in the Jump seat as part of his checking duties logs the hours
Someone with a Command rating acting as an F/O by employment and assigned duties has been known to log the hours as command
An F/O from an Asian airline is rumoured to have logged all his hours as an F/O as Command, in a separate log book, as the endorsement was on his Aust licence as a Command rating and is rumoured to have used these hours to achieve a Command in another asian airline. (discussed many moons ago on this forum)
Heavy crews on long haul log the hours even when ASLEEP!!!!
So you have to have an open mind when you assess the Log as to what is what, a spot check with one of the A/C shown on a day vs the log book could catch the really dishonest but the game is open to all sorts of VH-BIC.