I've returned open stuff before to Amazon, and I just had to fill out a form online about why I was returning it. I never had to talk to or contact customer service, it was all done through their website.

I sent an email specifically asking about returning the n900, and as long as it's in good condition, the max they would charge is a $15 restocking fee. Below is the email from them:

Hello,

I understand that you would like to know our return policy on the purchase of "Nokia N900"

In general, we issue a full refund when an item is returned in new condition as long as the carrier receives the returned package within 30 days of the day you received it from us. During the holiday season, we'll accept returns of items shipped between November 1 and December 31, 2009 until January 31, 2010.

For instructions on the return process and information on where to ship your item, visit our online Returns Center:

http://www.amazon.com/returns

You won't be able to print a mailing label online since it's been more than 30 days since you received the items. However, you'll find information about our returns policy and instructions for mailing your return in the Returns Center.

We'll also pay the return shipping costs if the return is a result of our error. Please know that if the return is not of our error you will be charged the restocking of $15.00 from your refund.

I hope this helps. We hope to see you again soon.

Please let us know if this e-mail resolved your question: