Nah it's in the Castle Anthrax
Ni!
It was just a cup that probably got thrown in with the other cups when they cleaned up after the Pass-over. Jesus after his Resurrection was noted to have eaten and drinking several more times at least....what about those cups, hmmmmmmmm?
Wouldn't those utensils be considered more Holy as they were touched by "Resurrected hands"?
I find the grail myths to be distracting superstitions that detract from the truth of Jesus' sacrifice!