This is the 1936th most frequent French word.
retrouvées
"Found again" or "recovered."
Here, 'retrouvées' is used as a past participle in a passive construction meaning 'found'.
Les clés que j'avais perdues sont enfin retrouvées.
The keys I had lost are finally found.
In this sentence, 'retrouvées' is used as a reflexive past participle meaning 'met again' or 'reunited'.
Nous nous sommes retrouvées après des années de séparation.
We met again after years of separation.
'Retrouvées' is used in this case to describe letters that were 'found' or 'discovered'.