How can you predict what you think was in the packet that Annemarie was to deliver to her uncle?

Based on context clues from the story, such as Annemarie's mother's warning her to be careful and the importance of the package being connected to the Resistance, we can infer that the packet likely contained secret or sensitive information related to the Resistance movement. It was probably something valuable or incriminating enough that the Germans were willing to risk capturing or harming Annemarie to prevent it from reaching her uncle.