Jackpot Dungeon Drop

As of April 2020 patch, Naslow's Treasure Map drops were removed from Instance Dungeons and replaced with Jackpot Dungeon Drops which are same crates as treasure hunt gave.

Maps were fixed in February 2021 and Jackpot no longer drops.

Dungeon Drop Items

 * Hidden Wooden Crate
 * Hidden Silver Crate
 * Hidden Gold Crate

Source
Gossamer Vault Ruinous Manor Commander's Residence Akalath Overseer Catalepticon Draakon Arena Forbidden Arena Corrupted Skynest Bahaar's Sanctum and related Hard Mode's I assume any new Released Dungeons should have these drop as well.