code: func (b Box) Find(name string) ([]byte, error) {
  	f, err := b.find(name)
  	if err == nil {
  		bb := &bytes.Buffer{}
  		bb.ReadFrom(f)
  		return bb.Bytes(), err
  	}
  	return nil, err
  }
docs: // Find returns either the byte slice of the requested
  // file or an error if it can not be found.