I think because Stilo sales really slowed up towards the end of its run, there could be a few old style grill models on 06 or 56 plates. Just examples that have been hanging around at the docks or something?
To check out whether an example is a genuine run-out model, you're probably best looking at the interior. The run-outs had seat material which had a kinda ladder pattern all the way up the middle, either on a grey or bright blue background. Earlier cars didn't have this.
Also, the run-outs all had silver speedo & rev counter backgrounds i think, whereas older models only had the silver on some Sportings.
If it's got BOTH of these interior touches but an old black grill, the grill couldve been replaced, possibly because of a crash. If however, it's on an 06 plate or later, got a black grill, black instrument backgrounds & no ladder pattern in the seats, it's likely to be genuine but been sat around unregistered for a while!