The product review I linked to says that the bike has a Gossamer. It's definitely an FSA, but I wouldn't know a Gossamer if it bit my shin (which chainrings sometimes do of course).
I've only ever seen one bolt. I replaced the bolt when we re-fitted it the first time. There was no sign of missing bits, but I suppose that stranger things have happened. Anyway, I think we'll follow the consensus here and go Hollowtech. If we'd been able to get one of those FSA sleeves in, I think it would have been square taper. I'm all for simplicity.