What Would You Do?

You send a birthday gift to your child who lives on their own in an apartment. The gift is inside a bubble wrap envelope and you have a tracking number on it for delivery confirmation. Your child says they didn't get the package but the tracking information says it was delivered. The apartment employees say it isn't there in the office, your child says it never came in the mailbox and there wasn't a notice, the mail carrier says it was left in the apartment office. What would you do?