Key loss "Frustangry"

Dad once again lost his lanyard with his attached key. I received a call from his caregiver's agency that he was overly agitated and both angry and frustrated. They recommended that I get out to him asap. I called him to get some more info or hopes of bringing him down a couple of notches. I spoke to his Friday caregiver and was told that he misplaced his keys and they have looked everywhere. He was getting angrier by the minute. She said that they had searched the entire apartment and various areas of the facility.

When I arrived, we retraced his steps even going outside to his birdfeeders and each of his food containers. She and I emptied every cabinet and every drawer and laid out everything in the middle of the floor just to double check, he would go behind us and check as well. There was not an inch that we didn't empty or inspect. We even checked both dumpsters. He just wouldn't allow us to stop. This continued for 2 solid days with all staff involved as well with quite a few accusations. The 3rd day he included a small wooden box being attached to the lanyard with $100 in it. He said he wrote a check and took it to the bank for cash for his expenses. No biggie since I have his checkbook and he has a caregiver everyday with the closest bank over a mile away And no car. I told him that I would contact the bank 1st and talk to the executive director with possibly filing a police report. He said he would take care of it. I told him my plans but, didn't follow thru just for the record.

The keys were found late on the 3rd day by maintenance. They told him that they found them on a floor. I showed up that afternoon with a new lanyard with the same exact keychain attached. We went to Home Depot to have copies made and he refused to wear his new lanyard. He wanted his old lanyard in plain sight. Went it left his sight and was not on its "official" hook, he became agitated and said it was taken out of his apartment again.

How do I handle this one? Is it normal for him to want to wear 2 lanyards everywhere? Did I make the mistake of buying him a new one? I'm trying not to become frustrated at his latest actions but, it's so hard.