I get that a button buck or a spike buck (as long as it's not forked I believe) are considered antlerless.

What about a shed buck?

Well, technically a shed buck is antlerless. Unless the buck is really close and you can see the spots where the antlers were attached I don't know how else you could tell the difference in the usual time frame that a hunter looks at a deer before shooting it.

Something that came up in a discussion from another state in GD-is a spike legal on an antlerless only tag? Don't remember the state but a guy posted pics of a buck he'd shot that wasn't big enough to be considered "antlered" but to legally be antlerless they had to be less than 3 inches. I always assumed a deer was antlered or antlerless, nothing in between. Apparently, in at least some states there's also deer that aren't legal on either tag.