A note of importance, looking at this discussion:
Mark Goodson Productions appears to have split its kinescope library when it made its 1990s donations between at least two archives: the Library of Congress (about which we are getting details now), and the UCLA Film and Television Archive (which has a searchable database).
An example of these splits can be found looking at Judge For Yourself: the Library of Congress has thirteen episodes, which aired near-continuously from late November of 1953 to February of 1954, while UCLA has fourteen episodes, of which five date to before the LoC set and nine to the last months of the run.
This explains a couple of the gaps already noted- for instance, the earliest surviving IGAS episodes are held at UCLA. However, it also gives this list value in a different regard- these lists by themselves attest well to surviving G-T materials for some series that didn't go to UCLA in large numbers and for which the reruns are not fully confirmatory (in addition to Two For The Money, it confirms how much survives of Beat The Clock, which I'm not sure GSN has rerun the entire 1950s primetime run of, and The Price Is Right, where sponsorship and Barker issues apparently combined to make a pile of episodes unrerunable).