The technicians are not supposed to go by the stickers because they can be triggered rather easily. If you go back, tell them that you do not care about the physical damage, you just want the keyboard to work and that if they think there is water damage to open it up and show you were moisture has damaged the board. When I worked for sprint people brought stuff like yours in all the time but it was still taken care of, especially when it was a known issue like the keyboard on the TP.