I would personally be surprised to find this to be a Loetz basket....
I have seen images of the Passau cases identify some of this production as Loetz, and there are actually many pieces in the cases displaying this type of glass which can be traced to Kralik through decors now known, and also links to the Butler Brothers catalogs which imported Kralik and Welz to the US market in large quantities.......
IMHO one issue with the Passau cases, being a privately owned museum (collection) is that they do not generally appear to go back and correct earlier mis-attributions as new information becomes known. The current curator for example, does not have much interest in going back to correct issues with the work of the previous curator......
I agree with the basket most likely being Bohemian........ It is a fabulous piece of glass...... Nice find.....
Craig