Well if I buy a ticket at the station before I travel I'm hardly likely to be able to copy it... And here's one TOCs requirements for delay repay:
TOCs regularly waive that requirement, I can assure you, in the interest of good customer service. London Midland even have a Delay Repay function on their App, whereby you can take a picture of the ticket with your iPhone and upload it with the relevant details.
I cannot think of a single TOC that will refuse a complaint because they haven't been sent the original ticket. TOCs will accept proof of purchase in lieu, whether that be a copy of the ticket, a receipt, booking confirmation, or bank statement.