All LSA and Nav equipments are listed under form E. Which Certificate list the FFE (Fixed and Portable) on board?

There is no convention certificate whihc will give you this information. Only way to get a reliable informations about the FFE is either through the onboard approved/reviewed safety plan or by refering to the 30 page Record of Safety Equipment (not Form E) issued by the classification society. This record is normally filed with the SOLAS certificates and is readily available with the master.