// unit_inv_hb
void main()
{
    object oMe=OBJECT_SELF;
    object oPC=GetLocalObject(oMe,"oPC");
    if (GetArea(oPC)!=GetArea(oMe)||GetDistanceBetween(oMe,oPC)>4.0)
    { // return inventory - destroy chest
      ExecuteScript("unit_inv_close",oMe);
    } // return inventory - destroy chest
}