I only ask because I once had a similar frustrating failed search effort on my phone, walked into the next room, performed the exact same search on my desktop, and found the item on the first try.
Ever since, if I have to do a search from my phone, I at least scroll down to the bottom of the page and click on "classic site" which seems to improve the search results. I still prefer to do searches from my desktop though, which seems to yield the most thorough results.
In any case, you never know if you're seeing ALL the matches, and incidents like this only reinforce that feeling.
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