There is very limited information out, hinting that this is still a big ongoing investigation. There are no dates attached to the arrest either. All it says is that someone running a Darknet Market for almost a year was arrested and some of his coins (5 figure EUR number) where seized. The market had been running for close to a year. This wasn't some clearnet shop so it makes me think that it might have been OASIS?
nope
https://polizei.brandenburg.de/pressemeldung/illegaler-webshop-abgeschaltet/426944
Drugs4You