Louis said he found his in the library, and everyone was running around trying to get their hands on another.
His has a photo of Paul Mescal as Sir Paul, and on the back has its own serial number.
“It’s just a blank postcard, but what it has, which is cool, is the number of postcards that have been made.
“It says there are 1,000 and I’ve got 63.”
The 21-year-old, originally from London, said: “For graduation, no matter what course you’re doing, you’ll get to shake Sir Paul’s hand, which is really, really exciting.
“I’ve spent the majority of my three years here trying to plan what I’m going to say to him, because I don’t quite know yet. But I think I’ve cracked it now with the postcard.”