You are probably right. I had another tab open on craigslist/austin w/ a listing for a Masi Speciale CX, 53cm. Just smaller than what I like in a cyclocross frame. Usually ride a cyclocross frame around 2cm smaller than touring/rec road frame. Forgot/cornfused that OP stated masi randoneur, not special cx, I had been looking at. Bikes look pretty similarly visually, btw.....

Anyway, yes.......and ride the bike and only buy if it fits and feels good...
Body geometries, stated frame sizes, frame geometries, all vary......