We have been recently successful in isolating the fcc polymorph of the key hyperexpandedfulleride Cs3C60 - this phase can be driven from an insulating to a bulk suprconducting state without symmetry change by the application of pressure. Its Tc passes through a maximum of 34 K at ca. 6 kbar showing a superconducting dome that is not explainable within the framework of conventional BCS theory. Our ZF/LF-muSR studies have now established that fcc Cs3C60 at ambient pressure does not display AFM LRO down to 1.4 K. With this urgent proposal, we want to address the nature of the electronic state down to the mK temperature regime in order to unambiguously determine whether eventually static (ordered/disordered) magnetism emerges on cooling or whether a true quantum liquid state without symmetry breaking is realised even at the lowest temperatures.