No Unique from strongbox

It says it contained a unique, but unfortunatly it didn't drop anything. I'm also playing on Geforce Now, so a loot filter is not an option (so it's not hiding anything).

https://steamusercontent-a.akamaihd.net/ugc/59207469194149205/D8D78A7F982241105F63810C576D8D46BD323B53/

video