If the owner's seal and epitaph are excavated in a tomb, it can be determined that the tomb is the real Tomb of the owner. In the Xigaoxue tomb, the seal and epitaph of Cao Cao are not excavated. 
the Xigaoxue tomb is not the real Tomb of Cao Cao.
If funerary objects engraved with the words King Wu of Wei are found in the tomb, it can be said that the tomb is Cao Cao's. stone tablets engraved with Gehu halberd commonly used by King Wu of Wei and other funerary objects are found in Xigaoxue tomb. Therefore, the tomb is Cao Cao's tomb