Even if they got the exchange's order-book they'd probably just see a bunch of orders from some guys named Morgan Stanley and JP Morgan. So many of these trades are routed or entered by brokers or other large firms.
You can’t have a broker issuing orders on your exchange without knowing who they are for and who were the individuals involved in requesting and approving the trade.
JPM has also a responsibility in ensuring the trades it issues through its brokers aren’t tainted with insider trading.
CME is also pretty pedantic in regards to who can trade on its platform.
Overall looking at the historical trade data there doesn’t seem to be any unusual trading patterns in the trades that VF reported as suspicious either in volume or position.
As far as the last minute trade goes this is very common not only on Fridays but at the end of every trading day where traders push a large number of trades just before the bell hits it’s pretty common practice it’s pretty much like taking out the trash.