Tundra stock gas cap has a plastic cap by the spring. Does the gas cap need to be replaced?

I appreciate your response. They charged me to run a camera down toe fill neck and saw something lodged at the gas tank. Then they had to remove the tank to get the piece out. It wasn't until later I discovered what the plastic piece was from. I told the service dept and they looked amazed and couldn't believe it. That was it. I tried a after market gas cap once and in a short period of time the check engine light came on.