Hi,
I live in south america (not going to say where exactly) i orderd a copy of halo reach (Legit)so from there i had the exclusive Recon attatchment, unfortunatly later on after playing with the game, the disc eventually broke, so i bought a copy from a nearby store which the game is obviuosly spoken in Spanish, when i revised the game all my armor i had was intact, HOWEVER! i dont have the recon exclusive attatchmentby before i broke my 1st Halo Reach disk, my xbox had a normal 4Gb flash memory, then i bought the 250Gb expansion.
So here are my two questions, is there a possibility for me getting it back the Armor attatchment? did it dissapear because of the Spanish Halo Reach disk i bought or from the 250Gb expansion?
Because of the new hard drive.
You would have to transfer the content over to your new hard drive. At least that’s what happened to me in the past with map packs.
I already made the attempt to transfer it i went to system, storage, flash drive, i look for every file it had what turned out nothing 
Do you still have the code for it? If you do, you might be able to re download it.
If that doesn’t work then the only other thing I can think of is to do the following.
Go to xbox.com and sign in using your xboxlive account.
Once signed in, near the top right under your gamertag it should say “My Account”
Click on “My Account”
Once you’ve done that, look for something that says “Purchase History”
Click on “Purchase History”
You will then be brought to a page with all of your past downloads.
Once on that page look for “Pre-Order Bonus Armor” and click “Add to Queue”
That should download it to the xbox console your current profile is on.
If none of that works, then I can only say try calling Microsoft for further support.
Hope it works for you!