What happened to Mannix's full episodes?

Mannix, the classic detective series that aired from 1967 to 1975, has had its full episodes subject to various availability issues over the years. While some episodes have been released on DVD and through streaming services, others may be harder to find due to licensing or archival challenges. Additionally, certain episodes may have been lost or damaged over time, contributing to gaps in complete collections. Fans of the show often seek out remaining episodes through various platforms to enjoy the series in its entirety.