How to find the 3DS serial number without the tags

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I got a 3DS during certain times in 2015, and is currently aging along with me.
Now I never realized this, but my younger sister got ahold of it and tore up the tags on both the box and the system. I want to sign up for Club Nintendo and see if my device is still redeemable there, but this is the only Nintendo handheld device I own.
What should I do?

Best Answer

Club Nintendo was discontinued in 2015, so there is currently no way to register the serial number of 3DS consoles.