Looked at time and sales after the close it was about 50,000 from 104-09.5 to 104-06.5 when I had left at 2:30 central. I would imagine this has to be related to the 7,000 3yr bundle in euros, but who knows. Either way, whoever bought the 5yr notes was not laying them off in any other futures and didn't hear of any size trading in the cash 5yr. Maybe these are hedges for all the auctions this week, as the 5yr futures are a good proxy for both cash 2's and 5's, but they definitely did more than enough to cover that.