How about someone writing a letter to Nokia or Microsoft that goes like this.

Dear Nokia:
Thank you very much for loaning me the N950. I've had a great time developing on it but have now moved on to continue work on Android and IOS which are currently more popular OSs and are somewhat more relevant. As I no longer have time to develop on the N950 I would like to return the device to Nokia. Would you please inform me as to whom to mail it to. As a second option, please let me know if I may simply keep it as it makes a very stylish paper weight and can be the interesting subject of conversation with visitors who query its appearance on my desk..
Thank you again for the opportunity to develop on this device.
Sincerely
Your Name