Can Golden Loot Boxes contain duplicates?

While reading online, I saw an interesting claim about Overwatch's golden loot boxes.

PSA: The legendary is guaranteed to not be a duplicate.

While I did not receive any duplicate items when I opened my golden loot box, I can't say whether or not it was by chance.

I've seen a few forum posters saying they've received duplicate Oni Genji and Officer D.Va skins, but this could just be a bug considering the skins were only added to regular loot boxes a few days ago.

Aside from the Oni Genji and Officer D.Va skins, are Golden Loot Box rewards guaranteed to be unique, non-duplicate items?

Solution 1:

Blizzard Support has come out and stated duplicate items from Golden Loot Boxes is NOT intentional, and that they will be compensating players who received duplicates with a second Golden Loot Box.

From the Blizzard Forums:

Greetings,

You recently received a duplicate item in your golden loot box. We apologize for the mistake, and you'll be receiving an additional golden loot box soon.

Thank you for your patience!

Regards,

Blizzard Support
https://battle.net/support