[ruonis55]

That he is returning the box without the CPU to the warehouse. Will the warehouse know that he didn't receive the CPU and only the empty box and that's why he is only returning it?

If (for example) he EB'd the CPU and was told to return only the empty box, the Information Is entered In the system as such.

When the warehouse/Inwards goods department scan the return, the Info comes up (on scan) of the empty box awaiting return, hence there's no cause for suspicion.

Good, thanks for the information. I thought that it is such a big company and maybe have flaws with this.