In that case i'm not sure.I think if there giving cash well there would be no protection like you would get using paypal say.I have sold things and they have came to my home with cash on ebay sales.All you can do is let them see the item for what it is so theres no hassle.If you have no returns in your description is a safe guard also.95% of folk are decent on ebay so you should have no trouble if there happy seeing it and end up paying.
Don't let an eBay buyer pay via PayPal and then collect. PayPal seller protection only applies if you can supply proof of postage or tracking for a posted item.
As the seller, you have few "rights" with eBay anyway. Check it is the buyer them self coming to collect with cash.
:shocked: Be very careful when inviting total strangers to your home ...