The Spirit Storage Rat's inability to sense treasures was not because there were none nearby; rather, the presence of the Death Jaw severely interfered with its natural perceptive abilities. It was like trying to spot a few insignificant copper coins at the foot of a mountain of gold; no matter how good a person's eyesight, they could only see the mountain, not the coins.
Resigned, Shen Mo gave the little fellow several pounds of dried meat and returned it to the Spirit Pet Bag.
Those who entered the Death Jaw and survived could always emerge within two hours, regardless of their experiences inside. If Shen Mo wanted to continue using the Spirit Storage Rat to search for treasures, he would have to wait until Chen Mengze and the others came out and moved farther away from the Death Jaw. This two-hour delay was acceptable.