yes, creo 1 comes with the same clamshell thing and parts. for whatever reason many dealers aren’t great about including all the parts, but it’s definitely supposed to be included in the bike.
the same fenders are for the sirrus, creo, vado etc but there seem to be very similar experiences to mine on different bikes. may have to do with tire size, frame size, the specific bike, user error, poor instructions … who knows. it would be nice if the instructions were specific to each bike instead of the generic if a) then b) …