Depends on what details you are looking for.
Totals for a 1099-DIV and 1099-INT (generally) go in without any details. The details for those are mostly for your information only so you can see exactly what contributed to each total. The capital Gains distributions reported in box 2a, are reported there only and do not need any further entries by you.
IF you think you need actual form 1099-B/8949 for the sales of stocks or sale of Mutual fund shares you owned...then yeah, those need to be in there...but only for things you actually sold, not for transactions that happened within a Mutual Fund. IF you had some of those transactions, then you need to Call Vanguard and inquire about them to see if they were missed, or are coming out at a later date.
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Where the Supplemental Details for your 1099-INT and -DIV do help, is if you have significant $$ amounts in box 8 of a 1099-INT, or box 11 of a 1099-DIV. Those details can be used by you to break-down the $$ amounts that came from your own state's bonds, and (potentially) get some reduction in your own state's taxes. But, you have to calculate the sub part of box 8 of the -INT, and box 11 of the -DIV that came from your own state...you have to calculate the amount....otherwise you have to designate those boxes as just "More than one state". $$ in Box 8 of the -INT can always be broken down if some was from your own state's bonds. For $$ in box 11 of a -DIV, it depends on the state...some states only allow a breakdown if the Mutual fund involved held a certain minimum % holding in your state's bonds. Illinois doesn't allow it at all (if I recall properly) .
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
