The aftermarket Flip Key shell is pulled apart the same way as the original shell and comes with a few extra bits.

Notice where the Transponder Chip goes, it's a tight squeeze.

Here we also compare the 2 shells, screw location in different spots (must be how to bypass copyright/patent, who knows). But the more interesting part, for myself anyway, is the 'Made in Japan' on the aftermarket key but none on the genuine Fob, hmm...