Does this yield anything for you John? Works on my lab but its only got a small number of endpoints
( name of computers of it, name of fixlets of it ) of results from (bes computers) whose (relevant flag of it) of bes fixlets whose (type of it = "Fixlet" and display name of site of it contains "Patches for ")
Query was adapted from Query computers vs relevant fixlets vs specific site - Reporting - BigFix Forum