Does Apple's warranty cover theft?

The warranty does not. But you can get AppleCare+ with theft coverage. I’ve copied the following from the link above your post.

File a Theft and Loss claim

If your missing iPhone is covered by AppleCare+ with Theft and Loss, file a claim for an iPhone replacement.

File a claim

You can also check with your renter’s or homeowner’s insurance to see if they coverage theft.

shawdy05 Said:

"questions: Does Apple's warranty cover theft?"

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No.

For future reference...

Troubleshooting a Lost Device:

Secure your Account:

Having Been Lost, Do Two Things:

A. Verify Your Devices:

Verify that your the devices logged in to your account or officially yours, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

B. Consider Modifying your Credentials:

Having been lost, someone likey has your credentials. So, by all means, consider modifying them, starting with a new password.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

C. Locating This:

Note that the location is the last place it had an IP Address. So, if at a library, contact it, asking them if it was handed in, and if the have it sitting aside. Aside from Find My, if using a third-party app (i.e. LoJack by Absolute Software), then log in to that site, seeing if you can locate it.