Yea I'm curios too... Hopefully it comes off with all the flaps still attached! Have been a few stories here of those driving about missing a flap for a while without seeing the effects...
In my case I knew the car was unwell, with a high probability that it was detached swirl flap/s. I bought cheap because of this, the seller was quite open that he'd had some sort of incident 6 months earlier, and the car didn't sound or run the same since. He'd stopped using it at that point and bought a Brera. So although I was hoping the rattle was just a sticky injector, then a rattly alternator pulley or crank pulley, my instinct was flaps. I didn't dare drive it, I only did ~70 very restrained miles before taking it apart.
Looking back, the idle was uneven, though it seemed OK at the time. The turbo was sticking too, and there was a sort of surge at low revs, like the throttle was not constant. One flap had gone through the engine, bending two valves. Another was detached and sitting in the inlet waiting to cause more wreckage. Just as well I took it easy.
I'm amazed it ran as well as it did, but I think that if you're used to the car and know how it runs, you'd know if flaps had entered the engine. Typically they make quite a lot of clatter as they get macerated.
So I think you'll be OK.
If not CDTI surgery are offering £40 refund as they'll clean it up and remove the flaps permanently then sell it on
The best thing that could happen to any manifold with metal flaps, aside from burial at sea.