They cant verify anytime, read the question of the member he/she is asking if they do it before or after 2nd AOR and the answer is after 2nd AOR and you are saying "ANYTIME" this is MISGUIDING. I pasted a link for you before in other thread which shows the steps of the process and now Canada1234 has also mentioned it, immigration officer has certain process to follow it not like whenever they want they can do employment verification and whenever they want they can request the medicals or ask the passport etc.
Cheers
Saki