Ask an employee to check the back, nicely
In IKEA, you don’t have to worry about being a Karen and asking an employee to check for something that’s not on the shelf. In fact, many of the store’s products, especially the ones that don’t sell very well, don’t have a spot in the front. So, if you know what you’re looking for but can’t find it, ask an employee to see if they can check the back.
The guys at IKEA are more than willing to look for you since they often know what’s on display and what’s behind the curtains. You might not get lucky every time, but it’s always worth asking.