Better question: How could a body which could simply disappear out of their hands and appear elsewhere be corporeal? The basic answer is that it wasn't, even though the experience was sufficiently real.
Uh, because He is God?? And can thus do things impossible to Man. The corporeal reality of Christ's risen body is one of THE key teachings of the Gospel, referred to specifically in multiple places, yet that same corporeal reality does all of those miraculous things.
After all, He made the substance of loaves and fishes appear out of nothing (as He did the universe itself). Mere translocation would be "child's play" tricks next to either of those.