I have one airpod that’s dead, and I lost my case and the other airpod that was in the case. How do I find them?

Unfortunately, there is no way to find a case or the AirPod that its in it. See the '/If you need to find only one AirPod or AirPod Pro' section in:

Find your lost AirPods - Apple Support

Anittawang69 Said:

"I have one airpod that’s dead, and I lost my case and the other airpod. I how do I find them?"

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Verify the AirPods Balance:

Two Methods:

A. On the iPhone, itself:

1. Go to: Settings
2. Tap: General
3. Tap: Accessibility
4. Scroll Down: to Hearing
5. Adjust: the audio volume balance

B. On an App:

Note that some apps have their own settings for volume. So, be certain balance on the app is as desired.