Last week I received three treasure keys as each of my characters turned in the first wanted bounty to Petra. This week, I only received one out of the three. A buddy of mine (Cobalt3030) received two last week and one this week. The June 2 Hot Fix update states clearly that the key drop is guaranteed, so I'm assuming this is a bug. Hopefully it's already known and is in the works!
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Hi CapN, You are only guaranteed one treasure key a week, per account. There is a small chance you may receive one on your other characters first bounty for Petra. Also, you are only able to carry 5 treasure keys at a time. Hope this helps