I ordered 1000 rounds of Federal 5.56 62 gr green tips. I was expecting a bulk loose pack box but instead got 2 cases of Federal XM855F 5.56 62 gr ball American Eagle 25 boxes 20 rounds. The ammo in the boxes looks the same as other Federal ammo I have seen. Is there any difference between 20 round boxed Federal American Eagle and the bulk 1000 round loose box from Federal? Thanks.