I found this extraordinarily unhelpful article:

Many dogs, including Labradors, were specifically bred to retrieve certain items for their human owners.

I guess precisely what those objects were was not of paramount importance to the author.

But I also found this, which suggests the answer is no:

Whether it was fetching ducks, birds or other game, these dogs knew their job. They were also bred for an attribute known as ‘soft mouth’, a combination of physical traits and attitude that meant they could carry the game without damaging it. If you have a retriever, you’ve probably noticed how gentle they can be during fetch.