Blue lanyard keys with brass compass

I lost my keys yesterday around 3pm outside the Billings Public Library on North Broadway. They're on a blue university lanyard with a small brass compass keychain, plus a silver house key with a cherry-blossom keycap. The ring also has a red plastic tag marked '12' and the keys feel a bit scraped from a rainstorm. They're important to me, not just for daily access but for a sentimental reason: one of the keys opens my grandmother's old apartment, which my family recently inherited. If anyone found them, email me at [email protected] and we can arrange a pickup near the library.