I found a site on google, dealing with old bank notes, you can check it out, it was just a google search that i did trying to help you. I do not know is it legit, you can call them or contact them on their mail, maybe they can provide the information you need. Here is the site http://www.oldcurrencyvalues.com/5000_dollar_bill.html
If this site helps you i would be very happy.