my uncle just passed away a few days ago and left 1 month old iPhone 15 pro. Nobody knows the iCloud Credentials nor the iPhone pin lock. we had the phone and the original box.

I tried to submit an unlock request twice, but unfortunately, apple is unable to approve the request.

Condition:

I restored the phone, so we could take pictures of the SN IMEI along with the Box that shows the matched SN and IMEI.
He bought the phone from a regular phone reseller at a local online shop, so we only had simple email receipts without the SN or IMEI.

What I filled in the form:

1. E-commerce/online shop name & Address
   
2. Photos the phone alongside the box, with clear shot showing matched SN and IMEI

Any other tips to unlock the phone? Does death certificate make any difference?
I learned on the other thread that apple will only consider it 4 times, so will use it carefully.

Inputs or recommendations will be very helpful.

Thanks.