Assuming already poignantly corrupt authorities have any reasons to police themselves, they also have a billion ways to stall, cover and act innocent
"Oh noes, we've been so overwhelmed, I swear I was just about to approve this, woe is me",
and it will probably be true (The first part at least), they just take advantage of it
Also there's no clear chain of custody for stuff or incentive to have it, "Lost somewhere in customs" is about as precise as you usually get at the best of times
