Samsung Galaxy S3 White 16GB - new - Boxed - WITH RECEIPT ?

I am selling my as new Samsung Galaxy S3 / SIII 16GB in white. It is as new, opened and used only once! Bought on Friday 8th June (2 days ago!) from Carphone Warehouse in Brent Cross for 500. I have the receipt to prove. Unlocked Phone is great however it is too big for me and I want to go back to a smaller handset. Selling as Carphone Warehouse do not accept returns. Boxed with everything. Cash on collection, 450 Central London