Don't think anything is normally mounted there, a capacitor at best, but it wouldn't have came clean off like that.
It might be the scratch, but it doesn't look deep enough.
ASUS has been known for on-and-off RMA service refusing warranty on basis such as "bent pins" when the motherboard was originally fine or for scratches like that.
But yeah.. if you want a Z87 motherboard to replace yours, holla at me
P.S. Aww yeaaaa