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Thank you CHAMP!!
When I contacted Investor Relations, they referred me to https://www.taxpackagesupport.com/et.
I called them a second time at [phone number removed] and was told that they don't keep any tax document that's older than 3 years. When I mentioned about contacting their accounting firm, they gave me the same boilerplate answer.
I've emails Investor Relations, but I think they are going to come back to me with the same response.

So, I wonder if there is any way I can report the Partnership Cash Distributions without the K1 for that year???

Or, can I simply omit reporting the Partnership Cash Distributions as it was mentioned under TRANSACTIONS WE DO NOT REPORT TO THE IRS section in my brokerage statement?