With the Lumos PSU kit I was able to test my Nixies in less than an hour (the time needed to build the voltage upconverter). Here she is:
Out of 5 Nixies purchased, three B5092 work. One B5092 is dead and the B5094 only lights up "u" ("micro") and "A" symbols.
Still, I am impressed they do work 46 years after the manufacture date!