"You've been training for 18 months... Bloody hell, most trainers go through their entire life without a Group 1 let alone 18 months.
"Get over it. Boo hoo. I backed Malaguerra - haha."
Mr Heys, who trains at Warwick Farm in Sydney, posted a picture of the letter and tissues to Twitter this week.
"I have copped plenty but this effort is up there," Mr Heys wrote with laughing emojis, and hashtags "old news" and "cheers for the free tissue".
In the emotional interview at Flemington Racecourse, Mr Heys said the race was the one that got away.
"I just don't get these opportunities. It's only my second season training," he said through tears.
"I'm just really proud of him."
He said Speith was a "high-quality colt" and would "have his day in the sun".