When you go through the initial set up of the Turbo, one of the questions asked is if you want to restore data from your Google account. If you say yes, then your wallpaper is restored, as well as a number of settings (display timeout, WiFi access points), though many others are not. So, seeing your wallpaper is not unusual.
Another reason that could potentially explain a wipe in your pocket is if you had a security and lockscreen unlock method set to pattern, PIN or password and the setting was set to wipe the phone after 10 unsuccessful unlock attempts. Actually, that may be a permanent choice for PIN and password unlock (the wipe after 10 tries - I can't find a setting for it myself). Anyway, I suppose I could see a scenario where the phone powered on to the lock screen in your pocket and somehow sensed touches to the screen as attempts to enter the pattern, PIN or password (especially a pattern, as PIN and password requires that you tap the on screen enter key), and then wiped the phone after 10 such tries.