I noticed 3rd Rail listed Seaboard Air Line. They purchased F3 Phase II units with the chicken wire. I think one unit was wrecked, but not sure what phase body was used to replace the unit. Usually it was the F9 body style, totally different from a F3 Phase IV.
As for the Atlantic Coast Line, their F3s were numbered 336 - 347. They previously bought F2s, numbered 324 - 335. they bought these F3s in 1948, and started buying F7s by 1950. Looked identical except the number series. I will have to check further tonight when I can look over my reference books.