LOLYes, Koine DID use punctuation and the Early MT manuscripts used them:
"Punctuation in Early 2 Greek New Testament Texts
It is because popular and still-circulating Trinitarian apologetic works, Greek grammars, and
works on the language and text of the NT often fail to completely or accurately inform others
about significant occurrences and the likely intended use of punctuation marks in ancient Greek
texts. Consider the following example:
In ancient Greek there were no punctuation marks; indeed, all words were run together with
no spaces between them and using all capital letters.3
As Comfort writes on the same page of his 2005 book (quoted and referenced on page 1),This
is far from the truth. In fact, if Bowman had simply reviewed some of the very Greek grammars
which he cited two years earlier in one of his 1989 publications,4 he may not have so wrongly
stated the matter concerning punctuation marks in ancient Greek."
The googlers are you friend, eh?
You'd think a person that must've spent 40 years of his life in college wouldn't need the googlers to help him find information.