Salam brothers and sisters. It was my birthday a few days ago and my non-Muslim friend gave me a birthday gift. When she told me she was going to get me a gift, I told her that I did not need and want anything, but she still ended up giving me a gift anyway. I did not refuse the gift as she had already bought things, and I did not want to cause her trouble; I also did not want to lose our friendship. However, I know that celebrating one's birthday is haram in Islam. What should I do? The gift is not really one that can be "donated;" she gave me a bag, a notebook, and pens. Is it right for me to return the gifts (she also gave me gift receipts), give the gifts to another person (e.g. a cousin), or can I keep and use the gifts?
Thank you for your time and answer.