Um why should u use server-strings for this?
use save-vars and playerid:
NPC Code:
if(playertouchsme){
//New Owner
if(save[0] <=0){
save[0]=playerid;
}
//If Owner nice message
if(save[0]==playerid){
say2 Hey Boss;
}
//if not Owner not so nice
if(save[0]<>playerid){
say2 Go away bastard;
}
}
for showing the owner's name I would use messagecodes, showcharacter and an empty gani (without showcharacter I always had problems with messagecodes, they didn't work the right way)