How Do I Send Proof of Purchase to Liverpool Apple Support?

That's begining to sound like the case.

I was also told prior to the visit, a sales receipt between myself and the seller would suffice, but obviously it didn't!

I'm wondering if a copy of the original sales invoice will do, or will they want the original piece of paper presented in person, which the seller may not want to relinquish, as HMRC expect receipts to be kept for 6 years.

The seller has sent me a photo of the original sales receipt.

After 4 days of trying to find a way to send the copy of the original sales receipt to the Apple Store as instructed via a 'Non Return To' email address. I'm beginning to think I'll have to make another 90 minute drive to simply hand the receipt in!!!

My other fear is that they will insist on the actual receipt and not a copy.

I have no faith in the online advice I'm being given as so much of it has been incorrect in the past, hence the reason I want to speak with somebody from the Liverpool Apple Store.

The iMac computer was sold to me in full working order. The seller, who originally purchased the computer from Currys, started to reset the computer to factory settings shortly after I arrived to pick it up. At some point during the procedure a message indicating a lengthy period of time left to complete the reset appeared on the screen. At that point, the gentleman said I could take it and complete the reset at home if I didn't want to wait. I elected to take it and complete the reset at home.

Upon reaching home I turned it on whilst holding down Command (⌘) and R simultaneously. All proceeded as expected and all went well for the next day or two. At some point, I was asked to sign in using my username and password.

Upon attempting to enter my username I noticed several keys on the keyboard weren't functioning, thus preventing me from signing in!!! After repeated attempts to sign in and failing to link another keyboard to the computer I decided to reset the computer to factory settings, but upon hitting the Command (⌘) and R buttons a locked padlock sign appeared on the screen. I eventually found out I needed the Firmware password, which I didn't have, to proceed.

I took the computer to an Apple Store in Liverpool, UK where an Apple Genius confirmed the only way to reset the computer was to obtain a key from Apple in London, and upon inserting the key into a USB port, it would be possible to restore the computer to factory settings and either bypass setting a password for the firmware lock, or if I chose, set a new one.

For that to happen I had to show some form of ID. I showed my driving licence and was told I could send in a copy of the sales receipt once the original owner had found it.

The original owner messaged me a photo of the original receipt and I've been trying for the past 4 days to find a way to send it to Apple in order for the repair to proceed.

I have a photo of the original sales receipt issued by the store that sold the computer to the person I purchased it from. He has the original, I have a copy.