Should a watch purchased from a TS come with a receipt?

[edweather]

Just purchased a beautiful new Rolex (5-18 on the warranty card) today from one of the top TSs on the site. The watch is awesome, but there was no receipt with it. So I called the seller and told him I received the watch, and asked if I could get a receipt. He said he would email me one tonight when he got to his computer to get the serial number, etc. I haven't received it yet, but in the mean time, was just wondering if an official receipt was actually necessary. I have text messages and emails proving I got the watch from him. Certainly not looking to be unreasonable if the receipt doesn't mean much. The seller explained the 5 yr warranty follows the watch. Thanks, Ed