Hello,
Yes the import by PDF if the most efficient way. If you notice a PDF that can not be imported while it should be, there is one topic dedicated to request improvement to the BoursoBank PDF importer PDF import from BoursoBank (ex-Boursorama Banque)
I do not have a BoursoBank PEA, so I do not know what are the 16 documents type nor if they can contains those cash deposits.
Another way to import transactions in PP in by CSV. Is there a CSV export available for BoursoBank PEA ?
If not, maybe an idea : if the deposits in the PEA were made from the BoursoBank compte courant, for this one you can export transactions in csv for sure.
There will be many other transactions from the compte courant, but if you can then accuratly filter only the ones related to your PEA (maybe they have “PEA” in their name ?) then you can import them into PP by csv.