The answer is that all bounties you have where the objective has been met is considered "complete", and is safe to hold until after TTK drops. heres the proof
https://twitter.com/knowsworthy/status/639614139602604032
[i]Original post deleted because 20% of this community are only interested in being hurtful pieces of human trash[/i].
Edit: I want to thank the people who answered without being rude, and also a big thanks to people who have commented to say they had this same question, too.
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2 Replies5000k bounties? That'll max every piece of armor and gear you could own.