Friend of mine lived in Beijing said it was very common to have the entrance door stolen in the building where he lived, same as bicycles and cars, the country is Communist same as their propaganda, people are murdered and robbed they just hide the numbers and if there is something big. They make a public execution so people stop asking questions.
Except for Tibet (where he had not been), China is a terrible destination to travel to. The people are cold, mean-spirited, and the place dismal and inhuman. Communist era style mass housing blocks and pollution make China the least interesting place to visit. Like anywhere else it is such a wonderful place to live until certain demands such as human rights anger the government then you will see how safe it is.