Hi. Welcome.
Thoughts?
First thought: That's a very high starting price for four pounds of marbles. [Edit: I see that you had a very low starting price, not the $585 that the bid is now at. Sorry about that confusion.]
Second thought: The steelie shouldn't be stored with them, and should not be allowed to touch them during shipping.
Third thought: There are some _very_ nice marbles there. However, you'll probably have better luck reaching your monetary target if you sell some of the nicer ones separately, with good individual pictures so that people can make informed judgments about condition.
There's a big difference in value between truly mint marbles and those in near mint condition.
Hope this helps!