Ipads are full of metal, and jigsaw blades are made of metal, so there is a sort of logic here. But here's what an iPad looks like going through an X-ray machine:
Not a great hiding place! Even the slight machining of the Apple logo contrasts sharply against the rest of the tablet's aluminum body.
The passenger, who was likely just trying to transport some Christmas gifts home, "turned them over," says the TSA, and "made his flight."