It is common practice. Often carfax issues show up months/years after an issue occurs. Thankfully it is shown on the carfax when the item was first listed on carfax. It shows that the dealership is disclosing all items to you, that they are aware of at the time of sale. I have my clients sign every page of the carfax report.
Not sure why they would ask you to do it months later other than if they forgot to do it initally.
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