where are the water sensor paper for late 2013 macbook pro retina?

[bombers408]

just want to double check there is no water spill before sending to apple.
i don't think i spill but sometimes my hands are wet and i use the laptop.

please tell me where the sensors are
the image you can download from here
https://mega.co.nz/#!NAlkxSaY!3EEyG4NWMTFAaU5IpKmrKOO42WNkR9SiABWDP5sew_4