Lost silver Powell flute with engraved initials near a bench in Hempstead Park, Long Island.

I lost my silver flute while walking in Hempstead Park in Long Island last Saturday. It's a Powell flute and has my initials engraved on the body. I was sitting on a bench practicing when I must have left it behind. I really hope someone can help me find it because it's not just an instrument to me, but also a cherished gift from my late grandmother.