How to deal with a delayed Apple Watch delivery?

I too would be worried about forfeiting $800.

You said that the Proof of Delivery states an incorrect address. As Katana-San says, that is indeed an issue that you should take up with the delivery service, in this case, that service is UPS.

You should contact UPS and file a claim. A package with that value is insured. But tracking a misdelivered parcel or filing an insurance claim can't begin until you, as the addressed recipient, take the first step and contact UPS.

https://www.ups.com/us/en/support/file-a-claim.page

M1 Mac mini, macOS 14.5;  Watch, series 7 GPS/cellular, watchOS 10.5; iPhone 12 Pro, iOS 17.5; TV 4th Gen, tvOS 17.5; HomePods, audioOS 17.5 and Airport Express w/ Airplay 2

Hello once more~ If I were in your place…then I would contact UPS. They delivered your product incorrectly and where it is an Apple product or something else it is their responsibility. Get all of your information together especially the tracking number and all pertinent information from your order and call UPS. Wouldn’t that be better than losing your $800? Anyway…I wish you the best and take care.

~Katana-San~

Apple is not here and no one here works for Apple.

No one here can help you more than the suggestions that we've given in our comments.

If you paid for this iPhone with a credit card, if Apple won't help, now is the time to contact your bank to request that they reverse the charges.

Hello~ What steps have you taken with Apple or with the shipper? Was the correct address entered for the order at the time you placed it? More technical details needed to assist you.

~Katana-San~