I agree. It sounds like the Bose Soundock ruined the battery. Many people are making the mistake of using Ipod accessories with the iPhone and they ARE NOT compatible. Even the iPod wall charger should not be used with the Iphone. The guy at the apple store was wrong.
It seems that the Bose Soundock sent the wrong amount of power to your phone, since it is made for iPod. The reason the phone is working normal and the battery is not charging, is becasue the improper charge fried the battery.
I know that you don't have AT&T or Apple were you are at, but if the phone will not charge or turn on, maybe you could mail it in to apple, and they could service it? what do you guys on EIC think? The only other alternative I see is trying to replace the battery. If his warranty is already void from unlock status and apple will not be any help, trying to do a a battery replace is better than a useless iPhone. (I know some of you will say that the battery cannot be replaced, but it can. Replacements are available on the net from sites like this one:
http://www.ipodjuice.com/iphone-batt...t-products.htm
Hope this helps.