Envelope T - What do I write on the front of the envelope?

ladybahamas
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I am about to send off my documents and translations of the documents to the Securite Social-Independants Etablissement d’Auray.  On the front of the envelope that they refer to as envelope T, it looks as if I have to fill in some values.

Caisse :
No de dossier :
No de poste :

What are these three values and do I have to put a stamp on the envelope?

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