I was changing my blade and this fell. I'm assuming it's from the TS55 REQ that I was changing the blade of. When I took the cover off I didn't see anything that looked like this belonged to.
When I checked and 110 people had viewed the post and didn't reply, I thought I should ask my wife to help me with an exploded view of the TS55 online. I didn't have to show her the webpage. It's a magnetic letter O from her kindergarten class.