What is the scope of a search warrant?

Const. amend. IV. To effectuate this right, it provides that "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." Id. The question we consider de novo is whether the search was unreasonable because agents relied on the affidavit in support of the warrant to expand the authorized scope of items detailed in the warrant itself. See United States v. Hurd, 499 F.3d 963, 965 (9th Cir. 2007) (considering whether a search is within the scope of a warrant is a question of law reviewed de novo).