Its a very interesting question, But 343 Didn't make the preorder and probably stopped the gift. D: Its a very interesting question, But 343 Didn't make the preorder and probably stopped the gift. D:343 did not want people to keep recon helmets after taking over from bungie but only deleted some peoples recon as i work for 343 i am very sorry :[
I still have mine.
Here's something you may try, but it may or may not work.
Go to www.xbox.com Sign in to your GT, then click on "My Account".
Under Membership and Content, go to Purchase History and look for your content that you downloaded to Reach, click it and let it download it to your 360. Go to Halo and check the Armory and see if you've got "RECONZ".
It may or may not work, as I said. I have mine because I work at Bungie, but now 343i, so, I can't guarantee but... It's a go for.