Here is a link showing the inventories of the Ishares trust....may be of intrest to Silver buffs. Noting from the article which is an actual inspection/audit of the trusts physical Ag holdings that JPM hold it for Ishares ...hmmm
http://us.ishares.com/content/stream.jsp?url=/content/en_us/repository/resource/slv_vault_inspection.pdf&mimeType=application/pdf