Unfortunately, most duck eggs look extremely similar so it's very difficult to tell breed by the egg (unless it's one of the breeds that lays colored egg). Yours are the ever-common cream color of most duck eggs, so not sure anyone can identify them for you based on just a pic. :/
Can you ask the friend where they got the eggs and what types of ducks were around? That would at least narrow down your search. It's also important to know if they are Muscovy eggs or not because they have a week longer incubation period than other duck breeds.
May I ask what the darker smears are on the eggs?