But after a public appeal he was reunited with his laptop, which contains the only full draft of the autobiography he has been writing for the past two months, late last night.
Listen to Jamie Mackay interview Matt Chisholm about his lost laptop on The Country below:
A man from Cromwell found it, and Chisholm picked up from his place at 11.15pm yesterday.
"Turns out he's a big Survivor fan, but thought it could never have been mine,'' he said.
The book is due in mid-March, but he was hoping to finish it this coming week.
He had half of the draft saved on a hard drive, but the rest could have been gone for good.