How to know which Apple ID is used to lock iPad if the display is dead? [duplicate]

Unfortunately, it is likely that your nephew temporarily used someone else's Apple ID in order to gain access to purchases that the other user had made. My son did this on his device, against my rules. If this happened, then that other person may have initiated the lock. Since you have an invoice, proving ownership and the device is only a month old, I would encourage you to use the 1-year AppleCare that came with your device. Here is the AppleCare contact page for Saudi Arabia.

Please let me know if this information is helpful for you. Did you by chance register your device with Apple, when you made the purchase? If so, then Apple will have a record of that action, as well.

Cheers, Byron

I finally resolved this issue. Here is what I did to know which account was used to lock my iPad:

1- Go to http://www.apple.com/support/

2- Select the device (in my case: iPad)

3- Clicked on Contact Support

4- Click on [Get Started]

5- Choose the country where you live in (in my case: Saudi Arabia)

6- Then select the problem category (in my case: Battery, Power & Chargin)

7- A list will come up to get more details about the problem. I selected (Unable to Power on)

8- It will optionally ask to send an email to the device (so that you click a button within the email and it will collect diagnostic information and send it to Apple for investigation), since the device is dead, you can skip this option. (click No, Thanks)

9- Depending on the Local time, you will get various options of how you may get technical support. I did these steps at 8:00 AM on Sunday and found four options:

a) Talk to Apple Support Now (toll free number in Saudi Arabia)

b) Call Apple Support Later

c) Chat

d) Take in for Service

What you really want is to CHAT since you will not have to wait too much.

Notice, I did the same steps the night before, and all I could get is option a) and d)... But the toll free number informed me that I was calling out of office hours.

Anyways, once you click (Chat), you will be asked to input the serial number of the device.

Afterwards, you will wait for a minute or so until a human being will be chatting with you.

I explained my whole story to him, and he re-assured me "no to worry".

He asked me a few questions to proof that I purchased the device among which he asked me about my apple id. I answered correctly and then he found out that an iCloud account, which was created at the first run of the iPad, was linked to my apple id. He asked me if I remember creating that icloud account. He provided me only with the icloud account email address, and then it all came back to my mind.

It turned out that the iPad is locked using the icloud account, not my apple id account...

Of course, both accounts had the same full name, and both were linked to the same external email address, and I uploaded him a copy of my invoice and then he gave me this information. No passwords were given needless to say.

I logged in to iCloud using the account he reminded me of, and I was able to remove the device activation lock.

I was so happy with the way it turned out. I was so happy to the limit that I decided to share my experience with the world.