Blue LEGO Creator 3-in-1 set with yellow baseplate

I lost my blue LEGO Creator 3-in-1 set yesterday around 3pm outside the Starbucks on Oxford Street, London. It's a blue plastic box with a white lid, about the size of a shoebox, and inside there's a bright yellow baseplate. The box has a small dent on the bottom-right corner and there's a tiny red dragon sticker on the front. This set was a gift from my sister and now it's become my nephew's favourite toy—it's got sentimental value and I'd really like to get it back. If anyone found it, I'd be grateful to be reunited with it.