I don't get it. If you have wires coming out of the wall, attached to something, then you should know where they are. If they get buried in the wall, you should know specifics of where they are and what they were for. In a big living room, 2 or 4 speakers should cover it nicely for listening to music. But, it won't do much better than a couple of floorstanding speakers as well. So, just use the speakers you are already using.
I am fine with whole house distributed audio. But, this is not that. It doesn't even sound like it is good in-room audio. The fact that it doesn't sound appropriate for the room itself is a red flag for me and makes me lean towards the suggestions of just removing them completely.
If your goal is to create a decent surround sound setup in the room, then you would want to make sure speakers are in the right location and will be a good part of your surround sound setup. But, that doesn't involve 8 speakers I expect.
Anyway, the ceiling speakers are useless without the wires. You need those wires and they need to be where your equipment is located.