my simple point is that an audit in a fluid market must have a single controlled point in time and even then it becomes very difficult to achieve accuracy due to the periods of settlement. For example, you can't audit broker A on Monday, Broker B on Tuesday, C on Wednesday, etc.... because by Wednesday broker A and C have traded with each other making the tally on Wednesday wrong for A but right for C.
The stock market is fluid so counts like this are impossible to maintain accuracy. Trading in physical makes it even harder because of the delays broker have in transfer of shares. If it takes you 60 days to get a cert, why do you think fluid cert counts are accurate in this?