In an answer of this specific question on stack exchange: What does some reports have the same safetyreportid? It is stated that openfda has duplicates: 'Duplicate and incomplete reports are in the system: There are many instances of duplicative reports and some reports do not contain all the necessary information'
However, checking openfda site for the duplicate field description:
The site states that openFDA shows only the most recent version (meaning there is no duplicates on the openFDA)
I am a bit confused whether the openFDA API data provides duplicates or not. I would love to hear more clarification about this matter.