Wireless keyboard & mouse warranty

I have a brand new wireless keyboard and magic mouse from apple that came with a mac. I don't own the mac, I got it for free from a friend that preferred to use a wired keyboard and gaming mouse. So I'm wondering, do I have warranty on these two products? I tried filling in the serial numbers on the apple website and it didn't recognize them. Why is this?

They didn't break btw, just wondering if I could sell them.

HotRodGuy said:

if you have an apple store near by take it to them, they should help you out

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Just called them and they said that all I have to do is come over with the device when it needs a repair. They can check the serial and all would be fine. Thanks!