Here are some examples of how it might be used:
* "He's got a box of nerves." This means the person is very nervous and anxious.
* "She's as a box of chocolates - you never know what you're going to get." This implies someone is unpredictable or has a variety of personalities.
* "The house was a box of junk." This means the house was full of unwanted items.
However, it's important to note that using "as a box of" is considered informal and slangy. In formal writing or speech, it's better to use more precise and grammatically correct phrases like:
* "He's as nervous as a box of nerves."
* "She's like a box of chocolates - you never know what you're going to get."
* "The house was full of junk."
Ultimately, the meaning of "as a box of" depends on the context and what is being compared to the contents of a box.