For those still looking for items: Donald Simmons kindly sent me the following info, which may help if items were turned in at a venue, rather than picked up by another attendee.
"All lost and found was turned into the respective hotels and the Toronto Congress Center, depending on where it was found."
Doubletree Hotel - 417-244-1711
Toronto Congress Center - 416-245-5000
Sheraton Hotel - 416-674-6100