GM, The cards are a reminder of a better time from his youth. A large majority of them will ask for something out of the blue that they haven't thought about in years. The comments he made about putting them in plastic sleeves is only an excuse to get them as he thinks that you will not give them to him. He most likely will do nothing more than to look through them and them put them back in the box they were in. He's reliving his youth through the cards.
This is a very "typical/normal" behavior for a crisis person who has gone back in time.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
