Anyone know where I could get a Tiffany ring box?

Hello all...I'm new to this.

I need help (don't we all LOL):D
Right the thing is my boyfriend wants to get rid of his ex's Tiffany engagement ring. He has the ring, the certificate, etc but didn't get the box back. Since it's worth a substanstial amount of money, he thinks it's worth selling after sitting the drawer for 2 years.

So in order to sell it on the likes of ebay it'd look better with the box.
Does anyone know how and/or where I could source one??
Apparently it's a dark blue box, within the traditional blue box.

All help will be appreciated...Thank you!!!!:)