Question

In Percy Jackson, what does Percy think is odd about the furies searching for an object

Answer 1

Because the furies are from Hades, and everyone knows (thinks) that he stolen the Master Bolt. So he’s wondering why they would be searching for the Master bolt when they already have it

Answer 2

Grover tells Percy that, when the Furies found them on the bus, they were asking, "where is it?" rather than "where is he?" It seems they are looking for an object, rather than a human.