I recommend this lesson: Clearing Ritual for a Tarot Deck. It has plenty of ideas for blessing a new deck!
There’s also a Forum topic about it: Cleansing and clearing my tarot deck
That sucks!! There are lots of people selling fake stuff on Aliexpress, Wish, sometimes reselling them on eBay, Etsy and Amazon.
Obviously you can still use the deck. Intention is what matters, and your friend shared that with you not really knowing what it was. Just make sure that you have all the cards that should be in the deck!