Mystery part

[Cideredup]

Hi all
after pushing my bike out of the garage for a ride, I returned to find this plastic "guard" type component on the floor.
Can anyone let me know what it is and where its from etc please?
do I need it?
Thanks a lot
Gareth

[Cideredup]

another photo

[Crap Tartan]

dont really recognise it, it could be a home made tail tidy sort of thing, take a look under the rear of the mudguard and see if it looks loike anything is missing?

[snapdragon]

nottacloo
not something I've noticed in all these years

the undertray and under seat area is the only place where there's an amount of black plastic AFAIK