Dismissing the small chat and getting down to business, Klaue asks the undercover agent if he brought the diamonds, and fakes a laugh as Ross makes a joke about the briefcase being heavier than he expected.
Spotting Klaue and his large entourage, Everett Ross approaches him and makes a joke about the notorious thief/arms dealer having new mixtape dropping — but it kind of backfires as Klaue offers to send him a sample.
It’s during this sequence of shots that we see that Klaue is now sporting a brand new fake arm (given that Ultron cut off his original one in Avengers: Age of Ultron).
Ross asks him for the Vibranium they are trading for, and Klaue pulls the precious metal from his fly — placing the paper-wrapped product marked “Fragile” on the table next to him.