MEMORANDUM **

Jonathan W. Grigsby, a California state prisoner, appeals pro se from the district court’s summary judgment in his 42 U.S.C. § 1983 action alleging First and Fourteenth Amendment claims. We have jurisdiction under 28 U.S.C. § 1291. We review de novo, Keenan v. Hall, 83 F.3d 1083, 1088 (9th Cir. 1996), and we affirm.

The district court properly granted summary judgment on Grigsby’s First Amendment claims because Grigsby failed to raise a genuine dispute of material fact as to whether defendants personally caused the alleged deprivation of his constitutional rights based on the isolated incidents of a piece of mail not being delivered and a priority mail package being delayed fifteen days. See Leer v. Murphy, 844 F.2d 628, 633 (9th Cir. 1988) (“A person deprives another of a constitutional right, within the meaning of section 1983, if he does an affirmative act, participates in another’s affirmative acts, or omits to perform an act which he is legally required to do that causes the deprivation of which the plaintiff complains.” (citation, internal quotation marks, and brackets omitted)).

The district court properly granted summary judgment on Grigsby’s due process claim because Grigsby failed to raise a genuine dispute of material fact as to whether defendants were personally involved in the confiscation or destruction of his excess stamps. See id.

We reject Grigsby’s argument, raised for the first time on appeal, that he was denied an opportunity to oppose summary judgment, because the evidence described in Grigsby’s briefs would have been insufficient to defeat summary judgment.

AFFIRMED.