Thanks for the feedback @BDecker!
The link you are looking for is: https://community.box.com/t5/custom/page/page-id/BoxViewMyTickets.
Currently this link is published below the Submit a Case link, but I can see how it might be overlooked:
We're looking at new design possibilites, and improving how to reach Box Support is one of the themes we're thinking about. This includes where links like this are published, as well as how they are presented.
Thanks again for the feedback!
Wanted to follow up after our recent structure changes to see if this has helped make the link to My Cases easier to find? We have consolidated all support contact info here: https://community.box.com/t5/custom/page/page-id/BoxSupportOptions#contact-options
Let us know if you have any other suggestions on how to improve the community!