Box 18 on a T4RIF

Had a client that passed away in October 2020. A T4RIF was received in his name with an amount in Box 18 for the value of his RIF at the time of his death. He also received a RRSP contribution receipt in his name for the same amount with the Transfer under 60L notation. Spoke with the person at Investors and he told me that I did not have to claim the amount in Box 18 on his ax return, that it is just for reference as the amount was transferred to the surviving spouse. Not sure that they have done this right, but he tells me that this is the way they always do it. If it is a straight transfer under 60L are slips necessary? If this was wrong can anyone suggest the correct way it should have been done.