U see that? The lockers I go to have been SE iowa & SC iowa. So- for sure not statewide. But- if I see 10% 1.5 year old bucks…. Be about right but maybe others seeing a lot different results.
FWIW, I have seen many young bucks at lockers in Solon (multiple times through the years), Washington(multiple times through the years), Newhall (multiple times through the years), Tiffin (Way back, no longer open, but multiple times) and Edgewood (Once, but I think I only went there once).
Almost all of my observations are now several years old though, as it has been 4'ish+ years since I was in a locker during a gun season, as I haven't shot any deer with a firearm in about 4-5 years now. Exception...I was in the Newhall locker in Dec. 2025, as I took some elk meat in to be processed, so I did see a pile of them then, FWIW.
So, I would say that it is, or has been, commonplace to see plenty of young bucks. While I have shot plenty of deer in Southern Iowa over the years, I have almost always brought them back up around my home, Iowa City, to have them processed, FWIW. Rough, rough guess, based on recollections from the past...30%-40% young bucks.