Retirement tax questions

Yes only forms such as 1099's and etc. that show witholdings are required to be provided. That's all the letter asked for. I had no W-2 etc. but had numerous 1099's but the only 1099 that had taxes taken out was the one they wanted. They asked for the same thing last year in a letter.

I will take a photo of the letter(redacted) and post in this message if I can.