BVA granted 50% for migraines and two 10% rating for knees and remanded a few things on knees. This was sent to RO in NC. It's been three months. How do I even know that the RO office actually has the claim
You don't know that your claim is being actively worked on and there's no practical way to find out. The BVA is a mess and won't be able to help and the rest of the system is at a bit of a standstill so you'll have to do what we all do...wait.