I guess you need to use rc = h.find(); such as:

Rc=h.find();
   If rc =0 then do;       /* rc = 0  means success == find */
      Your code;
   End;
   If rc = 1 then do;      /* rc = 1, fail, not found */
      Other code;
   End;
   
Or you can use h.check() function before h.find();
such as
   rc = h.check();
   if rc = 0 then  rc1 = h.find();