... Halo 4 standard edition sold under 3m, with unknown amount of bundles it's over 3m, Halo 4 Limited Edition 243k+.
or confirmed by other sources 3.2m without bundles.
Really only BenVTrigger could help us as he likely knows how many bundles they got.
But if Halo 3, Reach and Halo 4 had the same amount of bundles it doesn't really matter. Total sales 100k lower than Reach and 3 but within a tiny margin of error, so it's a tie.