[Biglad465]

I assume they'd request personal credentials, such as family & given name and date of birth at the minimum.

Ok thank you , I'll do some research and provide an update if I find anything else.

You're welcome.

When verifying a given account, almost every company will request an element of personal Information relative to the rightful account holder. Please keep us updated.

Update for anyone interested : Ended up getting on live chat and made up a story, they told me that all they'd need was the order ID but I feel like there was a miscommunication.
I did however find this in a vice article whilst describing refund services hackers offered.

The middleman [person doing the SE] needs access to the respective Amazon account, or if the buyer is uneasy about handing that power over, one advert suggests they can make do with the order ID of the item, the account holder's full name, billing address, email, and information on what other orders have been made with the account.

Article Link :

Spoiler:

https://motherboard.vice.com/en_us/article/gvy9q9/this-scam-lets-you-have-your-xbox-and-refund-it-too

I might try and deliberately get the password changed during a low value SE , but that's when I have more time. Thanks for your help @mothered.