Steve : I have exactly the same Ives cars only my "set" came with 2 "Parlor" cars and the baggage but no engine. I could see the information sheet you posted with the data 1914-1918 and the notation IVES 3200 set. I wondered is that the "set" number or just the number of the locomotive? Could the original set have had 2 Parlor cars or do you think my group just had an extra car? Sorry for the questions, but I don't have much data on early Ives.
My set was purchased in a little "mom and pop" hobby store (remember those) in Warminster, Pa (a suburb of Philadelphia) in about 2010-2011. The store is gone now, lost to being torn down and replaced with a CVS!!
Anyway thanks for posting, this is the first I have seen these cars anywhere else but my bookcase (LOL)
Respectfully
Don