Missing Lego instructions? You can download them online for free
Missing pieces on every order officially guaranteed by LEGO : r/lego
Find That Missing Brick With This Lego Parts Database | WIRED
Star Wars Missing LEGO Pieces - PCX Promise Customer Experience
Missing Pieces – LEGO Certified Stores
I've had the very rare missing piece before, but have never received a piece that (according to the parts list) isn't even in the set! Bag 2 in the new Space Shuttle