Updated for Supermarket Simulator v0.6
As of version 1.5.6 and game version v0.6, due to changes in the base game, AutoRack no longer simply racks what you ordered, it will rack all non-empty boxes in the street. Apologies if this inconveniences you if you store boxes in the street for whatever reason, but as a hotfix this was the only thing I could come up with. I may try and implement a different way of doing it in the future.