US Marshals Service has auctioned 2,700 BTC in a single lot mostly combining seized funds from a few Silk Road related cases.
http://www.coinfox.info/news/6244-anonymous-bidder-bought-1-6-mln-of-last-silk-road-bitcoins
It possibly would be a big fish like Tim Draper.
The US agents won't disclose the buyers until they themselves decide to make it public.