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oh.. oh the back of the board.. well no, I didnt think to look there lol. Heres whats on the other side of the board:
Which bits the aerial? The little round copper-wire-wrapped-nob?
And yes I did search specifically for mailbox/mail/letter/alarm/chime/alert/signal etc but the few I found specifically for the job were much more expensive then this one (which was $15 all up). We did lots of tests with it and its actually pretty good at not setting itself off falsely, the way I positioned it in the mailbox means it dosnt get wind or sun or heat or rain or can see anything other then a piece of mail directly in front of it. Its great.. the signal just dosnt reach to the front door :(
Im wondering if it would be easier to stick the receiver to the wall outside, get some extra cable and run the tiny speaker inside the extra 1.3m so it would be close enough to receive the Ding, and then the Ding can travel inside via the extra speaker cable (its certainly loud enough for me to hear the speaker inside the front door from the other end of the house!)
I really wish I knew someone in real life who knew about this stuff and could help, its like learning another language when you've got learning difficulties (which I do, which is making following this tricky!).
Edited: to make picture smaller.
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And cut where it says L1 on the PCB. Do try the extra wire on the battery negative, where it is soldered onto the pCB.
Couple of other things to try - since the antenna is actually the circuit trace, have you tried different orientations of the pCB ? Vertical, horizontal, sideways - long edge, short edge ? Is the face of the PCB with the squiggly lines perpendicular to the receiver ? Think of the squiggle lines like a filament in a bulb - you get more light if you are looking straight in to the filament, rather than side on, or edge on.
I really do think you are taking an overly complicated inefficient technological solution when simply installing a cheap lock on it would be more effective. People that steal mail (assuming you don't have someone with a vendetta) is all about opportunity. A lock removes the opportunity problem solved.
http://www.bunnings.co.nz/xcel-lock-cam-11mm-silver_p00161665
$13.13
vs trying to get an alarm to work so you can run out and get the mail
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richms:
I tried locking my mailbox and the asses just bent the flap up in the corner to get whatever was in it out.
yeah, just makes you a target - "So what have you got worth nicking from 'ere then ?"
Like tourist T plates 
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