I've noticed two black dots appear on my AirPods case after a few week's owning. It doesn't rub off. I was slightly annoyed at myself for damaging it but then I thought it looks too perfectly aligned for me to have done this. A quick Google has shown that a few others have had the same issue. Does anyone else have this/know what this might be? I found an X-Ray image it looks like they align with a specific part of the charging process.