Containing 64 blocks of Caramilk chocolate, the box was snapped up last year by former Cadbury front-line team leader Megan Fairley for $53.60 at a factory sale.
Caramilk was discontinued in 1994, but a limited edition run in July 2017 led to a million blocks selling out in just three weeks, before blocks began changing hands for up to $50.
But the box contains bittersweet memories for Ms Fairley, laid off last year after 17 years with the company.
About a year ago, her nightshift team produced the last box of the popular chocolate.
She is now appealing for ideas about what she should do with the box, believed to be the last full box left.
Ms Fairley would like to raise money for a mental health charity, following her experience with mental health issues after she was made redundant.
The poor treatment of workers by Cadbury owner Mondelez during the redundancies affected others, too, she said.
She spoke of the despondent reaction of staff when it was announced plans to close the Dunedin factory would lead to the loss of about 350 jobs.
"It's about raising awareness of the connection between mental health and redundancy," she explained.
"The day you're made redundant, that's not the end of it.
"That's the beginning.
"You can go out there and make a difference."
Last year, the 39-year-old launched shopping platform Notion Fashion from her Musselburgh home, aiming to highlight Dunedin and New Zealand designers, and she planned to organise two other events to raise money for mental health charities.
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Good on you, Megan Fairley. I hope the charity events do well. Just my opinion but I wish Dunedin Cadbury factory had open a chocolatier shop in another location. To leave a part of some of it's history to the community of Otago. I miss the chocolate, cakes and milkshakes. But hope even more for those effected by redundancy to have found brighter futures and careers.