Can I apply for a patent for what I bought?

I can't. According to the provisions of Article 130 of the Patent Law, a product or technology that is completely consistent with the existing products on the market cannot apply for a patent, but the things bought back are completely consistent with the things sold on the market, and neither the product nor the technology can apply for a patent. Patent right refers to the exclusive right granted by the state to the inventor or designer within a certain period of time in accordance with legal procedures on the premise that the content of the invention is open to the public and the invention has legal interests to the society.