 Possibly, although I don't know if any other place in the world has claimed to have the tomb of St. Thomas. So to me, that might be the greatest evidence that it truly is. At least by the fourth century or so, a lot of church fathers agreed that St. Thomas has a connection to India, and his body was then transported into the East Syriac milieu, to Edessa, and then later on now it is presently in Italy, in Ortona.