Coming from a Fangamer rep...
For clarification, we (Fangamer) did not lose anyone's shipping address; we are requiring new shipping addresses because we don't want packages getting lost in the mail due to backers having potentially outdated addresses in our system. Most of the shipping addresses we've received are few years old now, and therefore a significant amount of backers will have changed their addresses since then.
Also for clarification, we had finally received the remaining assets we've been waiting on from Comcept on July 3rd 2017. We had not been able to resume production or fulfillment of the physical rewards until Comcept had provided us with these assets.
We requested backers to confirm their addresses by July 17th (for logistical efficiency), however there isn't a hard deadline to contact us by; the sooner you confirm your address, the sooner we can get your rewards shipped. Please email firstname.lastname@example.org if you have any questions regarding your rewards.