How to translate written abbreviations and conventions into Spanish

ASAP (as soon as possible) – lo antes posible
by return of post – a vuelta de correo
c (circa) – alrededor de
certified true copy – copia certificada
c/o (care of) – para entragar a
cont’d overleaf – sigue al dorsodraft – borrador
encl(s) – adjuntos
FAO (for the attention of) – a la atención de
FYI (for your information) – para su información
incl. (including) – incluido
N/A (not applicable) – no corresponde
ps (post-scriptum) – pd (post data)
pto (please turn over) – sigue al dorso
registered – certificado
SAE (stamped addressed envelope) – sobre franqueado
TBC (to be confirmed) – por confirmar