02-06-2020 12:35 PM
Fortunately you correctly listed it is for parts or not working, and didn't undermine this by making any claims about it.
This should mean that eBay would find in your favour if the buyer opened a money back guarantee case because it didn't have a passcode. None was offered or mentioned in the listing. They don't have any cause to complain - eBay's definition of "for parts or not working" reminds buyers that this can mean they're missing essential components.
In any case, it's a bit late now to worry what they might find on your phone if they can get into it! If this is a real concern it might be worth offering them a refund on return.
If you sold it for spares or repair and the buyer has now got it fixed you are in a awkward position.
In order to complete the repair he needs to have full access and this would have been his expectation when he purchased.
The fact the phone may contain sensitive info is something you should have considered before listing.
You cannot reasonably expect the buyer to return a working phone to you without some payment to him for his time and any parts cost