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It’s going to depend on what you are looking for specifically, meaning the specific focus (theme, poster and so forth). Normally the Advanced Search function can go a long way, provided it is properly delimited by the search string, boards, and sought post age.
If it’s Satoshi related, this site includes a series of emails and posts made on this forum and p2pfundation, although forum posts are better read here to derive the context within the ongoing conversations in the threads:
https://satoshi.nakamotoinstitute.org/<…> I tried now and it seems there are some threads that got deleted, for the thread 1 to 4 has been deleted <…>
This thread talks about those first four missing forum threads. Three of them are viewable here:
Topic 3 was deleted years ago, and it is unknown what happened to it. Topics 1 and 2 were satoshi doing some tests, and topic 4 was some administrative notes left by satoshi.
See below for PDFs of the first topics:
topic 1topic 2topic 4As an FYI, there are links to the above topics in the link you referenced.