Jose De Jesus Hernandez Betancourt appeals his 46-month sentence following his guilty-plea conviction for one count of mail fraud. Hernandez contends: for sentencing, the Government withheld exculpatory evidence in violation of Brady v. Maryland, 373 U.S. 83, 87, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963); the district court erred by failing to order its disclosure and *321 using, at sentencing, it to calculate the amount of loss and number of victims; and his counsel rendered ineffective assistance (IAC) by failing to obtain that evidence.

Because Hernandez fails to show the exculpatory nature of the documents he requested, his Brady claim is without merit. See United States v. Moore, 452 F.3d 382, 387 (5th Cir.), cert. denied, — U.S. —, 127 S.Ct. 423, 166 L.Ed.2d 299 (2006).

To the extent Hernandez challenges the sentencing findings, his claim is barred by the appeal waiver in his plea agreement. See United States v. Bond, 414 F.3d 542, 544 (5th Cir. 2005). His claim that the district court erred in failing to order the disclosure of exculpatory evidence is without merit because, as noted, he fails to show the exculpatory nature of the requested documents.

Finally, because Hernandez did not assert IAC in district court, there was no opportunity to develop a record on the issue. Accordingly, we decline to review the claim on direct appeal. See United States v. Higdon, 832 F.2d 312, 313-14 (5th Cir. 1987).

AFFIRMED.