I’ve been reading through Signal’s government requests and couldn’t find a similar section on Mullvad’s website. I’d be curious to read about them if there are any. It would seem unlikely to me that Mullvad has never received any kind of court order for information about a user.
IIRC, they get requests for data, and, if the request is valid, hand over what they have, which is virtually nothing as they don’t keep logs. There is no provision in Swedish or EU law that could compel them to start keeping logs.