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I recently bought the Death Masque box set and noticed that there's one part in particular, part number 95, it's a shoulder pad for the space marines, and as far as I can tell it looks to have the symbol of the Iron Warriors on it. Now I could be wrong since I'm not familiar with every single space marine chapter so it could just be that it's very similar to the Iron Warriors symbol and in fact belongs to another chapter but I'm fairly certain it's an Iron Warriors symbol. If it isn't, what chapter is it from? If it is in fact the Iron Warriors, why is there a shoulder pad included for a traitor legion?

Mortifactors or Silver Skulls.

Silver Skulls, who are also rumoured to be Iron Warriors descendants.

Necrons?

As has been said, it the Silver Skulls.

http://wh40k.lexicanum.com/wiki/Silver_Skulls

Yeah that's the Silver Skulls.

When I first saw pics of the Deathwatch models I was pretty excited to see what I thought was a Death Guard shoulder pad but realised it may just be the Novamarines which made me sad (very similar chapter symbols). I still like to think it is a Death Guard shoulder pad.

Either way it could work to have trailer legion members as doesn't the Deathwatch fluff say that they may/do have members from more than just loyalist chapters? Blackshields (or whatever they're called) might even come from the traitors legions or marines from the old legions that remained loyal?