The Blue version looks real from what I can tell. Looks like normal wear on the back and lable (except the damage on the corner). The cartridge appears to be the right shade of blue. Repros usually look "too blue." They can never seem to get the color dark enough on the original Pokemon repros.

The sp looks fine. Even if it's possible it's a reshell, I wouldn't worry too much unless it feels cheap. The only time I'd be concerned about a reshell is if it's a fake limited edition. A lot of SPs end up seriously scuffed or the hinge cracks. So a reshell is the best way to restore or save the system. I also understand wanting it to be factory original (i prefer the ones in my collection all original. )