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Is the "La Poste" complement really useful, for the vehicles of that French administration? A French person will automatically identify such vehicles as a postal ones, but a non-French one (or someone not used to the French automotive landscape), if really disturbed, will certainly just wonder what this "Poste" in extra-field is (a trim level, a special edition, ???).
It depends on the vehicle.
For example, the Renault 4 vans, this is valid since the modifications, like the side window, were reserved for administrative vehicles (EDF-GDF, La Poste, etc.) and not available in the civil.