They only ask me for the receipt, but I usually only do $100 or under (I always do Logitech)
I photoshop a receipt usually, and they take it by the eye
Tell them you don't have a camera, and if they say ask a relative, say all your relatives are in some obscure place because that's where your heritage is and you are the only one living in (whereveryoulive)
I can give you a good template for a Walmart receipt if you want
Also, if all else fails, drop the SE, and try a G700 wireless gaming mouse instead. That was my first SE, and I am using it still. I couldn't get an unboxed G700s, because I ran into the same problem as you, so I did a regular ol' G700