Gotta be jewzlenskyy.. Hunter's never leaves his pocket and before long it's smoked and up his nose. He's a drug addict and millionaire career smuggler criminal so his personal stash is hidden under lock and key or on his person. He wouldn't just have left it in the White House. Since jewzlenskyy is a liar, murderer and thief, the only way this was Hunter is if it was briefly. He would have delivered it for him since they're allies and jewzlenskyy is most likely paranoid and nervous as his country crumbles as he hides and plans to move to his newly acquired israeli mansion.