Seems Like An Opportune Time to Clarify

In light of Germany offloading seized BTC, are there sources that show where their gov't actually seized it from, and more specifically how? It can't simply be a majority of cases where it's an open laptop or a discovered seed phrase like has happened to people in the past. I guess I'm looking for clarity on how Bitcoin seizures actually happen at all if it's supposed to be an un-confiscatable asset?