I've seen several Azando masters, and they opened their eyes to Baidi, because there is nothing behind them. Later, many famous temples hosted by Master Azando had nothing on the back, and some were temple seals. It can be said that nothing behind them is the classic shape of worshipping the emperor. In the later period, some masters showed their admiration for Di, such as Master Long Pupei and Master Long Pukun.
So none of the rest is fake, and none is true. The authenticity of the Buddha brand depends on the template, powder, aging and so on.
It's not just the back.