Elthos' biggest concern is getting caught robbing a grave. He did not want to use light outside, which would be easily spotted. If they find something, then he would want light to see, even if it is candle light.
At level 4 I am tacking trap spotter, which will help searching more. It basically says "I am always looking for a trap passively" without having to say "I look for a trap". till then I will be searching the room and walls for anything suspicious.