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INA118: Some questions about INA118U/2K5, labels and material supply

Part Number: INA118
  1. In the past two years, components are very scarce, so we often can't get materials from TI's agent Arrow.
  2. However, materials can be purchased from other channels, but they often paint labels. What's the reason?
  3. For example, I bought this component from our SMT factory, and they also painted the label.
  4. How can I identify whether the material is original? Why do they always erase the label?