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Shwa Girl, as I understand it, it was a special just for this worker. I believe he works on contract for the store so doesn't get all the same benefits as the regular employees. My guess is the manager of the fish department decided to just do something nice for him. The worker is a super nice person and goes above and beyond his job description.
I happened to be passing by the fish section when he was checking out his packages of fish and decided to just take 2 so he offered me the 3rd package he was not going to take. I had been chatting with him earlier when I first arrived at the store. Oh, and I gave him a coupon once so maybe that was a factor, though i don't think so. I think I just happened to be a in the right place at the right time, plus being a regular customer and our history of conversations :)