More photos in the comments. Is it supposed to be connected to the motherboard? I found it in the case. It wasn't connected. I think that the backside is some sort of thermal patch. I can tell that it's not a camera but I'm very confused and the connection reminds me of more of a laptop or phone connection not something you would see in a PC. The data matrix contains the same text as the white sticker.
I thought so too but I looked at about a dozen 3.5inch HDDs and they all use 3 or 4 wire ffcs with much thicker traces.
I'm sure 2.5 inch hdds can use thinner traces for their motors but I can't see why they would need more than 4.