If it is not posted, can a group say they have the shelter reserved. Do we have to move to a new shelter?

Not very sure about it, but to avoid a negative situation you should contact the right people to reserved.

I'm not too sure either, however, I found a link to where you might be able to find some information or at least maybe contact somebody who does know https://www.boonecountyky.org/departments/parks/shelter_information.aspx

Oh that I'm not sure of so I would contact where you reserved it at