Yes, they did get it all. I have a close relative who was very involved in the isolation and destruction of that cow (as well as other animal tissue that might have come in contact with it). The material from that cow never entered either human or animal food.
They caught all the material from that cow. But that cow was presumably infected via contaminated feed, and other cows must have eaten feed from the same infected batch of feed and so would also have been exposed to mad cow disease. Doesn't it seem likely that other cows may have contracted the disease but were never diagnosed?
Are we talking about the same cow? From an article dated 12/03:
"Despite their assurances of food safety, federal officials have taken the precaution of recalling 10,000 pounds of meat from the infected cow and from 19 other cows slaughtered Dec. 9 at Vern's Moses Lake Meat Co., in Moses Lake, Wash.
Officials say they are still recovering meat and won't know how much has been returned until later this week.
Dr. Stephen Sundlof, head of FDA's Center for Veterinary Medicine, said: "We expect by now that many of the customers who may have purchased some of this meat have been notified by the grocery chain. If not, they can contact those stores" related to the recall."