Is there any case law that supports a finding of probable cause for the seizure of a briefcase?

Furthermore, the dissent calls our attention to United States v. Allen, 644 F.2d 749 (9th Cir. 1980), a case recently decided by this court, holding that the warrantless seizure of a briefcase without probable cause violated the fourth amendment. However, that case is clearly distinguishable from the one at bar. The sole issue there was whether the district court's finding of probable cause was supported by the evidence. We held that the evidence there was insufficient to uphold such a finding. In that case, we specifically refused to address the question of whether or not the agent had a "founded suspicion." In the case before us, however, the district court found that the agent had such "founded suspicion" when defendants were stopped and, consequently, at the time the bags were seized, and the facts before us are more than sufficient to support such a finding.