If a collection's account was disputed on your credit report and the final results were that it got deleted off; can it later reappear back on your report?
Dispute results are never absolute/final.
See FCRA 611(a)(5)(B) for the requirments relating to reinsertion of information deleted based on a prior dispute.
After deletion based on a finding in a dispute, the information cannot be reinserted unless the party includes a Certification of Accuracy of the information.
That overcomes the prior finding that the information was not verified, and permits its reinsertion.
If the CRA obtains a Certification, they can immediately reinsert, but must send the consumer a written notice of the reinsertion within 5 business days after the reinsertion.
However, if information is voluntarily deleted, then its reinsertion has no requirments beyond those of normal reporting.