Yea, you don’t conduct military raids in allied nations. You coordinate with local authorities and send law enforcement. Or have the Germans do the seizing for you.
Only reason I can think of is you believed the German govt was in on the steal, and given the stakes you just say “screw it.” And dare the Germans to protest after the fact.
But that’s extremely unlikely.
I read somewhere that Merkel agreed to us seizing the servers.