Another iPhone 4G prototype spotted in a Vietnamese forum, according to the publication of the forum, the device was bought in America, from a Vietnamese businessman with an iPad. The new prototype is way different from the previous leak by Gizmodo, it has a tender memory indication (16GB), and also to omit the screws next to the Dock Connector. The outer casing of the device appears similar to that which had been in possession of Gizmodo.
This leaked prototype may be a previous or subsequent prototypes compared to the one Apple developer lost from device.
Update : Tinhte posted a video on youtube.