While poking around I found lines like this repeated in my FIllDB.log:
Fri, 02 Oct 2015 10:01:34 -0700 -- 2148 -- Discarding message from computer 3141800 because it has the invalid action site epoch ' ' (ought to be '03 Jun 2011 20:52:40').
…where “xxxxxxx” is an integer. How can I locate those computers? The integer doesn’t appear in the inventory that I can find.