Asking for Reimboursement - Feiulle de Soins

Bonjour tout le monde,

I finally received my final numéro de sécurite sociale + carte vitale. Now, I want to request reimbursement for medical appointments and medicine I paid last year since I was already insured (even though only with a temporary NSS).

I have all the feiulles de soins and facture from the pharmacies as well.

Questions:
1. Can I send all of the feiulles de soins in a single letter?
2. Do I need to write a letter with my personal information to send in the envelope too? Or as long as the feiulle de soins have my numéro d'immatriculation + signature (alongside with the other information filled by the doctor/pharmacy), I can send only the feiulles and it will work?

Thank you!