I Opened a Courier Station in Ancient Times

Looking for a Novel with a Pocket Space Connected to a Parcel Pickup Station

I really want to read a story where the heroine has a pocket space that’s a parcel pickup station! The only way to get what you want is by opening mystery boxes! She can pass the time opening packages in her space. Quick transmigration, transmigration, rebirth, any of those are fine! I’ve never read anything like this. Does anyone have recommendations?