The word you have as "true" does not appear in the KJV in Acts 17:11. I will quote the correct Protestant translation.
And the brethren immediately sent away Paul and Silas by night unto Berea: who coming thither went into the synagogue of the Jews. These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so. Therefore many of them believed; also of honourable women which were Greeks, and of men, not a few. It is Our LibraryLexiconsNew Testament Greek LexiconNew Testament Greek Lexicon - King James Version
Houto
The KJV New Testament Greek Lexicon Strong's Number: 3779
Original Word Word Origin ou&tw from (3778)
Transliterated Word TDNT Entry Houto None
Phonetic Spelling Parts of Speech hoo'-to Adverb
Definition in this manner, thus, so
First the apostle taught them. They could check if his quotations from the scriptures were found there, whether he quoted accurately or not. They could not judge if his teaching were true or false. They were unqualified to judge apostolic teaching. They could believe, or not believe. I think you know Luke wrote Acts, not Paul (although Paul is quoted frequently).
>>The word you have as "true" does not appear in the KJV in Acts 17:11.<<
So when they searched the scriptures to see if what Paul said was so you say it may still not be true? Got it.