Let's take stock. The first portion of Viktor Korchnoi's Tournament, Match, and Exhibition Record (TMER; 1946-2015) lists only the major events played by Korchnoi during the period 1946-1977. For the last few posts -- the most recent being Korchnoi's Career 1946-1977, More of the Same -- I've been comparing the TMER with the game record in Levy & O'Connell's book (L&O), which also covers the first 30 years of Korchnoi's career.
In the 'More of the Same' post, I identified 13 events missing from the TMER. The top portion of the following chart shows those events along with appropriate identification. Most are team events.
The bottom portion of the chart lists 34 more events where L&O gives between four and six games for the event. A handful of these match the TMER, e.g. '1957 European Team Ch., Vienna'. Another handful are listed on the TMER, but with a difference in the number of games played, e.g. '1950 Leningrad Ch. [13 games played]' but with only five games in L&O.
The majority of the events are missing from the TMER completely, e.g. '1956 ? [Molotov, Match vs. Kotkov]'. Most of the missing events are either team events or mini-matches. Some events have a footnote, e.g. '1959 Budapest (A)', which I'll address at a later time.