In 1952 a newspaper photographer in Passaic, New Jersey said he heard a hum, looked up, and took four exposures as an object passed low over his house and yard. The archive holds one account of it. This is the record of what was claimed and filed, not a verdict on what crossed the garden.
George Stock worked as a newspaper photographer, which is the whole of why this case exists at all. The account has him hearing a hum in Passaic in 1952, seeing an object approach low, and getting four frames off as it went over the house and yard. A disc is what the telling describes. Whether the exposures show one is a separate question, and the archive is not in a position to answer it.
What is on the record
The record is thin and should be read that way. The whole of the testimony is one telling on one channel, resolving to Stock alone. Nobody else in Passaic is recorded as having seen or heard the object. The archive holds no analysis of the negatives, no chain of custody for them and no account of what happened to the four frames afterwards.
One government primary document is attached, an FBI file from the Newark field office held in the archive's DoW UAP release collection. It is entered as corroboration and it is worth being precise about what that means. The file covers Newark field office material spanning 1952 to 1967, which is a fifteen-year run of reports rather than a document about this photographer on this day. It shows that the Bureau's local office was collecting UFO material in the period. It does not, on anything the archive holds, verify Stock's frames.
Why it sits where it does
Passaic grades L4 because a government primary record accompanies the testimony, and that tier measures the independence of sourcing rather than the truth of the claim. In substance this is a single-witness photographic case with a broad federal file alongside it. What Stock heard and photographed over his yard is not resolved here.