According to this Washington Post's Lifestyle article by Maura Judkis, Australian art collective Greatest Hits is working with a perfume maker to create a scent that smells like a MacBook.
"It smells like a mixture of ink, paper, foam, sticky tape and the Macbook with a hint of glue smell," Air Aroma Sales Manager Alexandre Cosic told the blog Co.Design. "The scent is very subtle, just like when you would open the box."
The group has created the scent only for Greatest Hits' art installation so far, but they're seeking a distributor. Air Aroma did not use any material from an actual MacBook to create the [scent], but rather, "various natural products such as leather, lily flower but also plastic film, cold metal and musk."