Cao Cao's tomb has been found. Why has Liu Bei's tomb never been found?
There are detailed records in the History of the Three Kingdoms, telling where Liu Bei's tomb is. And some grave robbers really wanted to steal it, but later a version was published. There is a photo of Liu Guan and Zhang together in front of Liu Bei's grave, which scared the grave robbers to flee.
Perhaps it's not how powerful Liu Bei is, but that Liu Bei has his patrons: Zhang Fei and Guan Yu. As we all know, many people will stick to the door during the Spring Festival. Door gods are made by Zhang Fei and Guan Yu, just to ward off evil spirits and drive away some imps.
It can only be said that these two brothers are really the backers of Liu Bei and his past lives and afterlife. When he died, everyone was so loyal and always accompanied him. The whole world is a little afraid of Zhang Fei and Guan Yu, really afraid of being cut down by them, and really will pay the price of their lives.