How can I get the Previous Key in search result for all the issue of a Specific Board?

[Arnab_Das]

I am making report of all the issues from few Kanban/project boards. I am getting the the recent key. But not getting the Previous key number, which was assigned at the beginning before the ticket move to new board. I need to capture that old key number against each individual issue against a field.

Please let me know hoe to do that.

I can see the old key in history but not against any particular field