Do i need to show proof of purchase for pulp at sheffield arena !

London to Stroud Return Leaving 10th August returning 12th August
Hi All, I have a pair of tickets, leaving London Paddington at 18:47 on Friday 10th of August to Stroud Returning to London Paddington 19:53 on Sunday 12th August Direct train Selling them at 30 each, price negotiable. Face value is higher if you book on the website.