In many modern engineered systems, including Cyber-Physical Systems, there may be many interacting components with coupled dynamics. Our prior work has shown that such systems exhibit fractional-order dynamics, which may serve as a concise model for such very high-order systems. This paper extends that prior work to a more general class of systems in which the operator describing the dynamics of the system can only be determined implicitly. A system-identification procedure for a specific set of example cases indicates that these systems are also predominantly fractional-order as well. In such cases, then, given the central role of system models in control theory, development and awareness of such fractional-order dynamics in CPS are essential for controls engineers.