Bicycle detail

I left my bike in locked to a bicycle rack outside the Recreation Center and the University of Colorado Boulder at 9:10am on May 15th, 2024. I came back from work with my friend Kit at 3:45pm on May 15th, 2024 and the bike was gone. There was no lock either. I had locked my bike with a U-Lock around the frame and that was missing to. I looked around for it and could not find it. There was a large truck outside where I left my bike at this time, but that was the only thing different about today.
My bike is a Specialized, blue/black bike that I think is a Rockhopper model. It was a birthday gift so i'm not sure of the specifics. It also has a bell that says "I love my bike" and a small light on the front. It has a squeaky front brake and a new, wide, squishy gel seat.