I love my AirTags, however they are too bulky for a wallet. I tried after market wallet finders in the past that repurposed AirTags into a sleeker 3D printed sleeves, however, the FindMy sound and battery life were poor.
Then I found Rhinokey and have not been happier. The card is super sleek, super loud, and rarely needs a charge (I’ve charged it once in the four months I have owned it). I love the fact that it also has a small slot so you could add it to your ID lanyard at work - after all, we are always looking for those.
My only wish, it had navigation finding like a traditional AirPod, but, they is more of an added bonus than a fault. The speaker is loud enough for you to be able to track it down.