CVT fluid history is the document that decides this purchase. The HR-V CVT is durable when serviced and expensive when it is not, and a car with no receipts has almost certainly never had the fluid changed.
Request the CVT fluid service record, then run the VIN at nhtsa.gov/recalls. No CVT records = walk away.
Est. cost: $120-$180 fluid service / $3,500-$5,000 CVT replacement if neglected
Source: Honda CVT service schedule