The most information I could find about it is a forum thread where angry FreeBSD fans react to an article talking about how the Nintendo Switch used FreeBSD components, which led to people mentioning the PlayStation 3 which led to a user talking about how Sony contributed upstream.
AFAIK it's common knowledge that the PlayStation and the Switch use elements of the BSD software stack.
That may not automatically imply 100% contribution, since the license allows them to use, modify and ship those elements without giving them back to the community.