I'd have thought the only way to have legit tickets is from the club.
That means you'd have to rejoin as a red and have a negligible chance of buying an actual match ticket, whilst the club fleeces you of £50 or so a year for 15 years until you upgrade to being a Silver. When you then have a midly better chance of getting a ticket. If the last couple of seasons is anything to go by...
Or ponce your club level seats from your company's account
“Other clubs never came into my thoughts once I knew Arsenal wanted to sign me.”