Will Costco let me return my electronic device even though I've used it for a couple of weeks?

Hi, I had bought a Samsung Galaxy Tab A 8.0 and thought it would be perfect for what I was needing it for and unfortunately I was wrong. There is absolutely nothing wrong with the tablet, it's just doesn't work for what I was wanting to use it for.

So my question is that I had bought this tablet last Tuesday(1-12-16) and was wondering if it's too late to return it to Costco and get my money back? Or am I just basically SOL? (And NO, money isn't the reason why I'm wanting to return the tablet.) I have never returned anything from Costco let alone returned any electronics to any store after using for a couple of weeks.

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