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Yeah, i reckoned that the miners would be false-positives. What do you mean by trying 'listunspent' ?
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My qt is in german, so the translation might be wrong, but if you rightclick on the trayicon there should be "debugwindow", which can also be opened from the main window -> help -> debug window.
Open console and type "listunspent" it will show you a list which might still include your missing btc.
Well, out of safety i already deleted my wallet(s) and went the offline-usb method (multibit with offline keys and stored wallet).