The rulling of quranic verse on certificate

Assalamualaikum, I on certificates a verse from Quran is there ,which is a Dua from Quran . And a person has submitted it and when he/she wanted to do some changes in it about date of birth , and the person ,who is a non Muslim and whom the file was submitted to , takes out a pile of file and he/she notices dust , the dust which like combines , a pile up dust in between the sides of the other files but not on the certificate. It is obligatory for him/her to tell the person to keep the file in a clean place and if not done , is it kufr . Thank you