Don't panic - a small error in the general scheme of things. I am sure others have done worse at the till.
I once went on a photoshoot for a media company and when I had finished I managed to erase the lot from the camera - it was a new camera - that's my excuse! Boy did I feel an idiot! I had to dash off and redo them all before it got dark. 
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I was just trying to void 1 item that I'd double scanned by mistake. They had already packed most of it by this time as well.
hope you enjoy the company and hopefully new friends 
and just chill 