Blue key fob with house and mailbox keys

I lost my blue plastic key fob with house and mailbox keys yesterday around 5pm near Syntagma Square, outside the Starbucks on Mitropoleos Street in Athens. The fob has a tiny dent on the metal ring and a red enamel heart charm attached. One of the keys is a bit bent from daily use, and the set shows some wear. This set is crucial for me because it opens my apartment door and the mailbox, so it's got sentimental value and I really need it back. If you found it, please message me so we can arrange a meetup near Monastiraki or return it to me at the Syntagma area.