Active from the second night. He will try to get into the cash register through the ventilation, unscrewing the bolts on the grille. When you hear knocking from above, you will need to wait a while for Plush Crocco to crawl away, after which you need to tighten the bolts. If you ignore him, he will unscrew all the bolts, causing the grate to fall and allow Plush Crocco to scare you. If you look at the ventilation when he knocks, he will unscrew the bolts with more force.
*breaks the ventilation inside to kill you*