If it is a scam, and there is no machine, then the "sellers" would be unwilling to provide a serial number. Of course there could be other reasons, including that they don't feel you need it, or that the machine has passed through several hands and they don't want you to know that. Tell them you want to try out the machine before making a decision, and you will be bringing some people with you (preferably at least one man and one person who already has a longarm) but no money. Then get the serial number and check it out with Nolting. There are too many horror stories about craigslist, so you need to be careful. If you do decide to purchase the longarm, go there with the cash and enough people (and tools) to help you take it home right then. Be sure to get a receipt for your payment, with a full list of everything that is included in the purchase.