There is a mismatch between your question and the content of the question. From the content of the question, it looks like you could not find the problematic publication. However, the question you pose is already assuming that you did everything that is possible to find the publication.
First: ask yourself (and SE:Academia community) if you really did everything you could to find the mentioned paper.
Second: since we live in a civilized world (or at least we try to have it that way), there is one important concept:
PRESUMPTION OF INNOCENCE
So unless you have sound proof of the publication being consciously and delibaretely fake, you should take a more neutral approach to the matter (i.e., replace the false word from the title).
One final consideration:
"checked the google scholar account of the applicant"
Google Scholar (GS) is just the name of a data-harvesting service, powered by a very obscure algorithm developed by an advertising company called Alphabet. If an item has not been indexed by GS, it does not mean the something does not exist. And even if an item is indexed by GS, you still should have reasonable doubts about the accuracy of the item.
If you really want to use efficently your time when looking for articles&co., the same 5 minutes you spend on the internet in Google Scholar, they can be more efficently spent by sending an email to your trusted librarian(s).
Other approaches may include contacting the co-authors, contacting the author, but those may be not viable because of independence or confidentiality of the application review you are performing.