I've been there. The 4 missing recipe/blocks are not listed there. The shophop administrator has told me via email that I must go through the stores again.
To quote the administrator's first email on Oct 11: "The cupcake blocks and recipes are moving around to different shops continually. They circulate through the "Prize Verification Confirmation Page." This page appears after you have successfully registered for prizes on the "Prize Verification Page." Be persistent to collect all 31 recipes."