A Murky Chain of Custody?

Now that the gag order has been lifted on the Anat Kam security leaks case in Israel, Ha'aretz, the recipient of the leaked materials, is reporting the case extensively. Latest report: Shin Bet can't find the two CDs on which Kam supposedly copied 2000 classified documents. Can you say "chain of custody," Shin Bet? Of course I suspect Israeli security case law does not have the same chain of custody requirements as the US, with the fourth amendment and all that, but this case looks more and more embarrassing as it emerges.