Well, scrap is under $100/ton, and you have to deliver. Since it has known issues and cannot be shown to run, that is the most it is worth. The next question is whether you want to attempt to turn scrap into working machinery. Any major thing wrong with it and it will probably make economic sense to scrap it. Don't get me wrong, it may turn out to be fairly easily put back to work. Give the machine and the owner the sniff test, is what I would do. Any claims by the seller are subject to "show me" or being disregarded. Mentally set your default to walking away and then see what happens. Don't be negative with the seller, be realistic. It is worth going through the process just to learn how to do it and become comfortable in the scrap buyer role. A lot of sellers ultimately need to get rid of things they have for sale, and will find it difficult to let you walk away empty handed.