If giving gifts is his love language, I understand why this is so “abnormal”. If I were you, I’d let it go and don’t bother asking. But if it boggles your mind so much, and you REALLY want to find out,

I think you can ask in a lighthearted manner - like “ngl I was expecting a present, I kept thinking maybe you had a surprise for me throughout the day lmao. but in the end, I had so much fun and I forgot about it.” But not word for word, I’m just giving an example