I have had similar problems with this level of ambiguity. Have encountered lots of otherwise native plants that were intentionally placed at some point, but have become self-sustaining, reproduce, and are otherwise indistinguishable from a completely wild population.
I’ve also encountered this problem with wildlife restoration efforts. Restored populations are often much more intensively monitored than wild remnant populations to ensure maximum survival, and evidence of this monitoring has resulted in some of my observations being flagged as “not wild” even when I provide documentation of the restoration effort responsible for the population.