For years, SLV had consistently maintained 103.2M ozt silver in their NYC vault. That changed late last year. For the last 5 months, once per month - around the middle of the month, SLV has drained 3M ozt (~93.3t) from it's NYC vault (in ozt):
Nov20 London🔼3.6M
Nov20 NYC🔻3M
Shares🔼700K, Net...
http://maxkeiser.com/2011/11/01/maxs-handy-trading-guide-for-timing-central-bank-interventions-jpm-vs-slv/
It would be interesting to see some data on this.
Jeff Nielson speculates on JPMogan's COMEX shorting:
http://www.bullionbullscanada.com/index.php?option=com_content&view=article&id=22646:slv-and-silver-manipulation&catid=49:silver-commentary&Itemid=130
It will be interesting to see if his assertions get any sunshine in the class action...