1. How did they get the information on his finances?
2. It isn't only about warrants, see bold. It's separated from the warrants by a comma. Personal electronic information has rightly been classified as being included in "papers, and effects".
"Amendment IV
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."
What you put in bold, and your ability to to read, is off.