Final answer:
The yellow package's contents are not mentioned in the question. It could be anything depending on the context.
Step-by-step explanation:
The yellow package that CJ gave Charlie is not specified in the question. Without more information, it is impossible to accurately determine what is in the package. However, in a story or a fictional context, the contents of the package could be anything the writer imagines, such as a gift, a letter, or even a surprise.