We are not able to get logs for any of the 131 oldest AbuseFilter modifications on Portuguese Wikipedia:
either by the API query
or by the UI:
where the oldest log is from 17 March 2009, and corresponds to the oldest change listed in the AbuseFilter's history:
(I wasn't able to check the analogous API query for enwiki, because of T54918)
Would it be possible to run some maintenance script to add the missing changes to the logs of the affected WMF wikis? This would allow us to get this information from Wikipedias using the MediaWiki API.