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To get the Reach name plate to unlock you had to have played Halo 2 on xbox live before it was shut down in April, if you didn't you can't unlock that plate.
As far as stats for Halo 2 not showing up, the only thing I can think of is that you may have changed, or made a new xbox live account since the last time you played Halo 2.
Stats are always tied to a GT, not a Bungie account. Try searching for any other GT's you may have used and see if anything comes up.