Why leaks survive
Every one of these leaks shares a property: it is an absence rather than an event. A lost deal generates a decision, a conversation and often a record. An enquiry nobody called generates nothing at all. Systems, reports and meetings are built around things that happened, so things that did not happen pass through unnoticed indefinitely.
That is why an audit has to be designed around looking for missing actions. The question is not what went wrong, it is what should have happened and did not.