eSignal shows 200k+ traded in the minute data, but no such big trades in the T&S (around 20k traded during this period). Knowing esignal, it may just be their fault tho.
Just got off the phone with CME and they say they are looking into it. They maintain that 20k is the rule for a max position both during the RTH and after hours as well. The spike generated enough attention that CME says they were already looking into it when I called. They don't reveal the results of investigations officially. They did thank me for calling and are always interested when anyone has information or questions about activity that might be suspect.