Each document leads you to a separate internet page.
The email reveals a link to https://www.foxhole-enterprise.com/
The newspaper article provides you with the following link to the local media NRW-Cologne
https://www.lokal-anzeiger-news.com/en-lk-200509
That should help you along further.
On the Foxhole Website you should try to log in as employees.
One of the newspaper articles reveals a useful “the-social-network” account https://the-social.network/en/mitglieder/helen-innstein/
You can log in as any of the employees. Some of them are a bit more tricky and will require more effort than others.
Try to log in as Erik Fischer and Johanna Kohler.
The “the-social-network” account will lead you to another account.
When you have managed to get into Erik Fischer and Johanna Kohler’s personal accounts, you should take on the others: First Helen Innstein and Will Nolte, then move on to Karl Ludow and finally Thomas Jung.
The personal accounts might even take you further along. Have a good look.
You have now accessed the personal accounts of all employees. In Karl Ludow’s emails you will find a link to a Casino & Hotel website. In Thomas Jung’s emails you find a link to a private detective.
Now you have all the necessary information to solve the case. It’s up to you to piece the information together and to draw your conclusions.