ONLY the taxpayer can release any part of a tax return. For anyone else to do so is a felony. IF, big IF, MSNBC had any moral standards or propriety, they would launch an investigation to find out who had broken Federal law and had stolen those two pages.
You may have never purchased a home or refinanced one. Copies of taxes are generally provided to the lender by the borrower. We saw the 1040 page with the stamp (Clients Copy) on TV last night, so Trump must have given the copy to another, willingly. If all of the schedules were included, which would be a normal practice given the security now required for a loan, it is likely more details on more schedules will see the light of day.
BTW, it is damn funny and karma that the Alt. Right/crazy right wingers have their panties in a tangle when two pages of Trumps taxes show up, and cheered when Wikileaks released volumes of personal correspondence by actual theft of Democrats E-Mails.
F'ng hysterical hypocrites got their comeuppance!