This calls for a special maneuver called the "Stick you head between yer legs and kiss your arse goodbye!". So called because nothing else describes the maneuver as accurately.
I'm not sure I understand what you wrote correctly. You are telling us that you realized you left the store without paying for something and YOU WENT TO THE POLICE instead of just returning to the store to pay for it?
OR
Security picked you up outside of Mustafa as you left and called in the police and then the store pressed charges. Which?
What I cannot understand is HOW you can MISS paying for something if it was in your shopping basket/cart? Or did you "put it into your purse/pocket/shirt" by "mistake" and conveniently forgot about it?
Please enlighten all of us as I would guess everybody who has read your post is wondering the same thing as I am but are too polite to ask!