Gearbox/clutch drama

just my two cents when my tranny was fixed this fall ( Roadster2013) a couple of gears apparently undamaged were replaced just for peace of mind .. I wonder if any would be useful to yours??
 
Cheeky little bugger slotted straight back in when I was taking it off...and here it is..The $1 part that caused about $1000 worth of damage...