Wouldn't the sheer number of coins involved make tumbling services almost useless. What is the volume that a single tumbler gets per day? If you put in tens of thousands of coins, and there are only a few dozen coins in the Tumblr that day, your coins are going to be most of what comes back.
Sure, if they were all stolen and tumbled at once. The descriptions of a cold storage "leak" suggest that if the loss was due to theft, it was a gradual over an extended period.