For standard Oreo cookies, how many would be a kezayis by volume? I have heard maybe 2.5 or maybe 3.
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According to the site projectsbyjen.org, the dimensions of an Oreo are 1.75 inches in width, and .314 inches in height. Since there's, surprisingly, not a lot of easy to find info on Oreo dimensions, let's go with this. A k'zayis (according to berachot.org, quoting Rav Bodner's "Halachos of K'zayis") is 28.8 cm³ (the most stringent view (I think), equal to half the volume of an egg.)
So! Approximately 2.3 cookies in a k'zayis, though because of empty space under the ridge, and the grooves in the cookie's design, maybe move it a little closer to 3.
Looks like you heard right. :)