Place the mouse cursor over the word 'Use' on the big green button for the chest To run it - RIght click on Script to run as Administrator Logged in after getting out of that 'newbie account' city I used to do a few things with AutoHotKey in my Guild Wars days.
I went very simple and it worked like a charm.
Did you figure this out? I had the same issue as you (13,000 chests) and got tired of numb fingers.