A large part of what he’s getting salty about is that at Ikea there is no “back” where inventory is stored - it’s all out on the floor/customer-accessible warehouse space. The “back” literally just has the clipboard with the employee schedule on it and Darcy’s brownies - a secret stash of inventory isn’t going to magically appear.
Given how strongly the many thousands of disgruntled retail employees would like to do that job, it’s probably a volunteer position.