First things first, calm down. It's easy to get excited with new presents. Lay low for a while, keep it in your closet or SDB and don't advertise you have it. Then after a week or so, you could come forwards with it, talking about how you were gifted it but wanted to make sure it was legit/not stolen first
The key is to just take precautions with new items like that, stay quiet about it for right now. Do not draw attention to yourself and you should be okay