Later, in the battle of Dingjunshan, Liu Bei and Cao Cao were killed on the battlefield. Cao Cao killed Xia while he was there. Because of him, Cao Cao lost his country many times. In this way, Cao Cao killed him, killed him in the war, or told others that Liu Bei killed him, so that he could get away with it. After the Dingjun Mountain War, Xia Ben was supposed to be buried in Hanzhong, but he was buried by Zhang Fei's wife, so his tomb may be in Hanzhong for this reason.
Of course, every historical record is not comprehensive, and there are historical records. His real grave has long been unknown. Hanzhong's tomb is to put his clothes and bury his clothes and other items in the tomb to commemorate him. But in fact, the real tomb has long been unknown, but some later generations speculated that his tomb had long been dug up by Cao Cao because he hated Xiahou Yuan.
As for the fact that you said the tomb was in Xuchang, there is no textual research yet. Historical materials are not very clear about his specific cemetery records, so it is unknown whether his tomb is a rumor in Xuchang, but the only thing that can be known is that his clothes are buried in the cemetery in Hanzhong, not his body. Moreover, his brother Xiahou Chun's tomb has long been leveled, so it is really difficult to find his tomb.