You made it only to Bad Homburg near Frankfurt. Unfortunately the suberb Trackable-hotel nearby Frankfurt airport was archived as it was plundered three (3!) times. So the owner did not want to risk further plunderings.
I hope I can help to bring your suitcase to a cache or cacher so it can travel to Vietnam.
But much more I hope your friend has been able to leave Vietnam since the start of covid-19!