I think the New adventurer pack is supposed to be an exclusive for those who have just joined the game. I only installed it on Saturday, and the pack was already in the store and had a 10 day time limit. Oddly, the time limit did start at 10 again when I logged in on my second device about a day later, but didn't change the time it was available on my primary device. The buried treasure pack didn't have a time limit, just said "for a limited time".
I hope they make that pack available again. Had I known I would lose it I would have purchased that one first. The 20,000 gold is such a better deal than Valeros, Orange dice, and 5k gold