Please moving onwards, when you receive a dup jira ticket, before you close it:
a) add your own name into the watcher on that open one,
b) when you received an email that one is been fixed in verification mode, turn back your own one then verified it.
c) and even better, exploratory test the sounding area a bit to see if there other broken occurs
I will later on put some of these suggested “best practice” into our team wiki page for our reference. https://wikis.rim.net/display/EnterprisePersona/Best+Practice
Thank you
Christine