Received 3531 - Box 1 & Box 6

[BrandonCJGrimes]

Hello,

I completed 2022 taxes a while back with Turbo Tax desktop. For whatever reason I received a Form 3531 back with boxes 1 and 6 checked.

Box 1 seems pretty straight forward. However box 6 I'm confused. It says to attach supporting document(s) for your entry for federal income tax withheld.

Does this mean I need to send all the w2s, P&L statements, K-1, etc??