Part 4 of a series reassessing the documentary record behind the 1933 Magenta narrative. TL;DR Three alleged Roosevelt–Marshall memos are used to document an American recovery program before Roswell. Their custody histories and unexplained alterations prevent them from carrying that claim. The Marshall page’s “correct” file number was already public in 1964, and later Army replies do not establish a 1942 recovery unit. These failures do not disprove every underlying event. · Part 1 — Before t...