Update: That is the SKU for Radio Shack. This is very good news, as it supports the belief that the phone will ship to retail stores.
Thanks to some deciphering by nycphog @ SprintUsers, the T608’s SKU has been determined. It is: 17-2570
While that SKU may have been created before the phone was put on hold, it does indicate that the phone was ready to ship to stores (as many of you know, over 30,000 T608’s have already been produced and given to Sprint.