Ask for documents and signatures. I bought a star card signed by Sven Baender on Taobao. I don't know if it's true, please ask the great god to identify it.
If you just want to feel at ease, I will answer you: "Really"! But in fact, it is impossible for you to let the great gods help you identify such a picture. If you really want to know the truth, the way is to find an appraisal agency to help you, such as Beckett. But the cost can probably cover your card price. But there are also advantages, you will get a special sealing brick for identification, which also increases the card price in disguise.