Did I get a refurbished unit?

I just got a new apple keyboard from the apple shop. The packaging was already different from what I see online, where the box is wrapped in plastic. Mine just had a latch with a sticker. the keyboard itself was wrapped in the usual paper-like thingy but I could already see some dust under it. on the aluminum of the keyboard there was a dot that looked like fly poop. I managed to remove it though with a lot of scratching. some of the buttons feel mushier than the others. the serial number starts with "F". I read that for iPhones this means that the unit is refurbished. is this also the case with apple keyboards?

If so can I request to get a non-refurbished unit from Apple?