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Abstract: Open system dynamics of an electron is studied in the presence of radiation field, confined between two parallel conducting pates. It has been suggested in previous works that the quantized zero-point modes of this field lead to finite decoherence effects, possibly due to the Casimir force. However, in this work it is shown that the off-diagonal elements of the reduced density matrix of the electron are suppressed due to the sudden switching on of the interaction with the environment, and would not be observationally relevant in typical scenarios. The work clarifies important theoretical aspects of the setup and argues that any irreversible loss of coherence, in general, should not be ascribed to vacuum fluctuations. It can only originate from emission of bremsstrahlung by the electron, due to the acceleration caused by the effective Coulomb potential of all the infinite image charges.