if you are planing to use the unique id more in the future , i would suggest using this
the script would look like this
prontera,0,0,0 script rewards 444,{
mes "something";
if(!gepard_int_get("freebies")){
gepard_int_set("freebies",1);
mes "here is the rewards";
getitem 502,1;
}else{
mes "you already got the freebies rewards";
}
close;
}