iPod touch lockscreen wallpaper location?

[tablo13]

I want to use this wallpaper for my LockMS, it's set as iOS lockscreen wallpaper but it's not in my camera roll. What is the location for iOS lockscreen wallpaper?

 

[Sonny bro]

Wirelessly posted (Ipod touch 4g 4.2.1: Mozilla/5.0 (Sonny Bro!; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

Settings>wallpaper. It should come up with your wallpaper