Sorry to learn about these missing articles in Pocket. We'd like to try and help you track them down if we can. If you're interested, just click "Contact Pocket Support" at https://help.getpocket.com/ and reference this post, and someone on our team will take it from there.
Regarding your other comment, Pocket offers basic search (title and URL) for free, and Pocket Premium includes full-text search so you can find text throughout all of the articles you've saved (with support for operators if you want to get fancy).
In addition, you can save any URL to Pocket, so feel free to try saving those Tweets or Facebook Posts. How they'll appear in Pocket depends on a few factors, though, including whether they're public or private.
Regarding your other comment, Pocket offers basic search (title and URL) for free, and Pocket Premium includes full-text search so you can find text throughout all of the articles you've saved (with support for operators if you want to get fancy).
In addition, you can save any URL to Pocket, so feel free to try saving those Tweets or Facebook Posts. How they'll appear in Pocket depends on a few factors, though, including whether they're public or private.
Hope this helps!