What does this idiom mean?

There are just BITS AND BOBS in the box = there are small things of various kinds.

You can also say BITS AND PIECES.

    Actually, there is a song named BITS ANS BOBS by The Dave Clark Five. From the first line, you can see that the phrase has another meaning.

    Since you left me and you said goodbye
    (I’m in pieces, bits and pieces)
    All I do is sit and cry
    (I’m in pieces, bits and pieces)

    And the song goes on like this)) Pretty depressing…