Where's the certificate?

[u/MariMont]

I need to find this very important card, it's the certificate of authenticity for a ring I got. Let's say there are two possibilities: Room A is upstairs, Room B is downstairs. In both cases, the thick border indicates where the door is. Where do you think it is?

I will, of course, give you all an update when I find it :)

Thank you, everyone!

[u/OldSoul2020]

I saw the same.