If it sat behind a drawer in a padded bag untouched for 15 years, how did it get broken?
If I had a device that I believed had up to 1000 btc on it I'd be training myself up to try to recover it myself. Maybe go buy an old but working mp4 player on ebay and swap the motherboards. If that doesn't work it's probably fried. "Smoking" is generally a bad sign for electronics.