<prompt> Human: Hello. Long story short, a friend of mine found these stock certificates from the early 1900s locked in a metal box inside a wall while remodeling a house. They appear to be absolutely legitimate with signatures and gold seal on them.TexasKentucky Oil Company, Incorporated Louisville, Ky - 150 sharesLouisiana Purchase Oil Co. of Beaumont, Texas - 50 sharesGreat Western Gold Company of California - 100 sharesHow do I go about figuring out if these are worth anything? Googling the company names is getting me nowhere. Id appreciate any advice.Thanks!  <response>: This should help you to get started: 