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Are you asking whether overlooking something is per se evidence that they were willfully noncompliant as opposed to simply negligent?
Is your concern the applicability of the limitation on liability of a CRA under FCRA 610(e)?
FCRA 610(e):
I would simply file a renewed dispute limited to the information not previously considered.
If they then refuse to consider, you would have basis for asserting willful noncompliance.
As an aside, including multiple items of asserted inaccuracy in the same dispute would likely be mitigation against any holding of willful noncompliance. It creates admin problems for the CRA in handling the dispute, and in my opinion, should be avoided by the consumer.
The CRA is, for example, required to forward a copy of the dispute to the party who furnished the disputed information.
If more than one furnisher is involved in a dispute, that creates clear admin problems for the CRA in having to then produce multiple, sanitized copies of the dispute for each furnisher.