Stink and the incredible super-galactic jawbreaker

The super-galactic jawbreaker Stink brought did NOT break his jaw. One letter of complaint later, and -holy jawbreaker heaven! -he receives a huge box of sweets [for FREE]. Soon he's writing more and more letters and getting more and more stuff. But with so much parcels arriving through the post, it's easy for Stink to miss one small but very special envelope...