Immediately after Achan confesses to taking the forbidden spoils, Joshua dispatches messengers to verify the truth of his claims [ביאור שטיינזלץ]. These messengers do not just walk; they run to the tent. Commentators offer varying reasons for this sudden rush, ranging from a feeling of relief to the fear of a coverup.
One approach suggests that their speed was fueled by a great sense of joy. Finally, the cause of the national sin was exposed, and the guilty individual was identified, proving that the rest of the Israelites were completely innocent [רד״ק]. Alternatively, the rush to the tent was driven by a deep fear that the evidence might be tampered with. The messengers hurried to get there before the members of the tribe of Judah could intervene. There was a concern that Achan's tribesmen might remove the hidden spoils to discredit the lottery that had just pointed to his guilt [רש״י, רד״ק]. A similar perspective suggests the urgency was to stop Achan's own relatives from taking the items to hide their family's shame [מצודת דוד].
Upon arriving at the tent, the messengers found the stolen goods exactly as Achan had described. The mantle was hidden right there in his tent [רד״ק, ביאור שטיינזלץ], with the silver placed directly underneath it [ביאור שטיינזלץ].