A visitor searched your site. They got a page saying nothing was found. They left.
You will never hear from them, they will not fill in a contact form about it, and nothing in your analytics distinguishes them from anyone else who bounced. As far as your reporting is concerned, that visit simply did not convert.
Fetchie keeps the list of exactly what they asked for.
Why this list is worth more than the popular one
Top searches confirm what you already suspect. Failed searches tell you something you did not know.
Every entry is one of three things, and all three are worth acting on:
Something you do not have. A gap in your range, your services, or your content, identified by people who came to your site specifically expecting to find it. That is a stronger demand signal than any keyword tool will give you, because it comes from your own audience rather than a national average.
Something you have under a different name. You sell it as a "planter". They searched for a "pot". The product exists, the sale was available, and the vocabulary lost it. This is the most common cause and the cheapest to fix, usually by adding the customer’s word to the page.
Something search should have found. Content that exists but is not being indexed properly, or a strictness setting that is too tight. Worth checking, and quick to confirm.
Counts change the priority
Each failed query carries how many times it was searched. One person looking for something unusual is noise. Thirty people over a month looking for the same missing thing is a decision waiting to be made.
The counts turn a list of curiosities into a ranked to-do list.
Where to find it
It sits on Fetchie’s Insights tab alongside volume and top searches, and the headline appears in the digest email so it reaches you without anyone remembering to check.
The digest is the part that makes this stick. A report you have to go and look at is a report you look at twice and then forget. A short email once a week keeps the gaps in front of you while they are still worth fixing.