got an order, customer address was wrong. she shifted but did not updated in her profile, hence the parcel was delivered to old address. advised her to retrieve the parcel from old address but she dont wish to. so what shall i do now?

Hi, we just started listing our backpack on amazon.sg. Currently shipping to SG only. I noticed that other stores offer free international shipping from SG. I have not found shipping cost to make this feasible. What shipping service method makes this possible?