I killed a deer last Saturday that I was positive it was a mature doe.
But, I walked up to it after it was down and could smell "rut"! I thought that was weird...but it was even weirder when I went to dress her and saw she was actually a he! I combed my fingers through his hair and there were in fact tiny hard antlers under the hair.
This deer was not a button buck. He was too big, he was clearly rutting (stinky and stained tarsals), and had hard tiny spikes on his head not skin covered buttons.
Guess it is as possible to have an antlerless buck as it is to have an antlered doe.