I want to give box for inspection but when I go there to do it there is nothing there at all has this achievement been retired.

You can no longer have Pastry Boxes inspected.But if you have a full pastry collection you can get a from him as another part to the plot.

The SAI won't let me give them my boxes, too. Maybe its because we're full Zombies?

Edit: Ah okay... too bad, but hey, at least I was loyal to the Zombies, :D