RaidenSnake

Hi all. Long time rider, first time poster. I was hoping someone could shed light on something that happened to me this morning coming into work. Only a couple hundred feet away from where I park in the city, something pinged off my 2006 Kawasaki Z750S, from the front end I think. I could have just ran over a large pebble but it felt more like something came off from on the bike. I should have stopped there and then but I carried on and parked and walked back to where it happened to find whatever it was. Apart from a pink child's shoe, all I found was this strange little thing (pics in the links). https://ibb.co/zWgBPfk https://ibb.co/DfQFN1b https://ibb.co/FYy68mJ I'm hoping someone can shed light on what this is, or even if someone recognises it as something else so I know this wasn't it. I've had brake pistons fall off my bike before so I don't want to take any chances. Thank in advance.