Whether you're done or not you won't find a cache at the posted coordinates. You will find the cache by completing this step of the Murals of Ludington Adventure Lab. Are we done yet? Since you can do the adventure lab in any order you wish we simply don't know the answer.
Jung jr qb xabj vf gung vs lbh arrq n uvag sbe guvf gura lbh zhfg or cerggl arj gb trbpnpuvat. Vs gung vf fb gura jr'er tbvat gb yrg lbh fpengpu lbhe urnq n yvggyr.