On April 18 at least six police officers from the National Operations Department (NOA) of the Swedish Police visited the Mullvad VPN office in Gothenburg with a search warrant.

They left without taking anything and without any customer information.

https://mullvad.net/blog/2023/4/20/mullvad-vpn-was-subject-to-a-search-warrant-customer-data-not-compromised/

Mullvad VPN was subject to a search warrant. Customer data not compromised - Blog | Mullvad VPN

On April 18 at least six police officers from the National Operations Department (NOA) of the Swedish Police visited the Mullvad VPN office in Gothenburg with a search warrant.

Mullvad VPN
@mullvadnet You don't keep payment information either? It could be used to find out who is using your service, couldn't it?
Don't use VPN services.

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@kallekn @mullvadnet Probably the police asked for customer information other than payment information, which they happened not to have. Or, probably the police asked for customer information which is related to a specific connection (or group of connections) being made, but customer information has been decoupled with login credentials.
@Orca @mullvadnet Probably. But how could the police know without checking? And how could they check without seizing data? It would be interesting to know a bit more about this.
No-logging of user activity policy - Guides | Mullvad VPN

We do not keep activity logs of any kind. Learn more about what this means and why we choose to operate this way.

Mullvad VPN