Flashy, get yourself another spare because this one "will" be lost quickly
And it might be an idea to put a key ring on with "if found please contact xxxxxx" on so it can be collected or perhaps someone else's address or his name & school class no etc so it can be dropped off if found . Certainly NOT your address.
(something to identify its owner but not where they live)
Mine have had keys since they were at high school, if I can trust them with the internet then I can trust them with a key.