Converted old trad IRA to Roth in 2017. Found old paper statements to support $6k of the $23k that was converted were NOT deducted from the prior year taxes, so those were NOT tax deducted contributions. Put $6k on the 8606 as the basis. Should we file this year on paper and provide copies of those prior year IRA statements and tax returns for those years [1995, 96, 97]?