This has already been mentioned, but there's no means for TE to find this trap. Find Traps is possible, but RC definitely has very few ranks, which would make finding this trap difficult.
For those who mentioned "RC definitely would have obsessed over it", he is also a heavyweight in confirmation bias. "This doesn't do anything, it's just a line" is much more likely.

Also, I had to make sure Minrah was coming along. I was worried!