In Cincinnati the DOI quarters are everywhere. I just searched a box of CWRs with probably 200 Jefferson quarters in it, about evenly spread between Philly and Denver mintmarks.
And yet, I've found zero July 4th quarters. Tellers I know who search coin deposits have likewise come up empty. I heard one report of someone finding two at a bank in Cincinnati, but it's tough to say how credible that rumor is. I suspect our reserve branch simply did not receive any of the marked coins despite claims of "random" distribution from the US Mint.