ArcheAge-style gambling? No, it's not lockboxes, but in-game casino gambling looks to be implemented on the game's Korean servers. An article on 2p.com has the details, which are somewhat premature since the author had to sneak into the closed facility via some crafty climbing and judicious use of glider wings.
Inside he found a "spacious hall with lavish decoration" as well as slot machines and three types of exchange trophies, one of which was "obviously [a] blueprint of [a] house." If you're playing the Korean version of ArcheAge, you can check it out for yourself by following 2p.com's map which marks the location on the game's Fantasy Island.