Formal:
* Bravo pour m'avoir trouvé ! (Bravo for having found me!) - This is the most straightforward and polite option.
* Bien joué pour m'avoir retrouvé ! (Well played for having found me again!) - This implies that the person had lost you before.
Informal:
* Chapeau ! Tu m'as trouvé ! (Hats off! You found me!) - This is more casual and playful.
* Génial ! T'as réussi à me trouver ! (Awesome! You managed to find me!) - This is very informal and friendly.
Specific situations:
* Merci de m'avoir retrouvé ! (Thank you for having found me!) - This emphasizes your gratitude.
* C'est super que tu m'aies trouvé ! (It's great that you found me!) - This highlights your appreciation for their effort.
The best option will depend on your relationship with the person and the overall tone of your interaction.