Looking for a specific Cognac.

A friend of mine won’t stop talking about a cognac he had once before and wants to get again. I would love to get it for him for Christmas if it’s still in circulation. The only details he’s given me is that it was a square shaped, and matte black glass bottle. He doesn’t remember the name of it, or anything. And I can’t find it anywhere just by looking up “square matte black bottle of cognac” or anything of the sorts. Hoping someone in here has had it/knows what I’m talking about! Tia.