Today occurred another perfect example of what was discussed, earlier.
There were a series of trades at 11:16am that were in the amount of shares as follow: 1200, 3000, 300, and 4711, which total 9,211 sold at $0.78/share.
Then, at 3:53pm there was a block trx. for 9,211 at $0.76/share.
It would be very (let's say extremely) unlikely that an arbitrary number such as 9,211 wouldn't be that discernible, otherwise. A number such as 9,200, maybe, but a number such as 9,211, no.
In addition, these five trades constitute 33% of today's transactions. Not too hard to find a tractor in a hay-stack under those conditions.