Before we all yell at the thrift store kids, many older cameras open by pressing a button hidden under the leatherette, and people who haven't dealt with them don't have that figured out, and better they should display it from the back then try to force the front open. What would also be helpful is if they put a ruler in the picture, but most people don't know that size is critical here.
It's a plate camera. On the back, it has thin rails at each side that a plate holder slides under, I think (unless they accommodate a back that then holds the plates). These cameras can be quite compact, but the problem with using them is that the back and rail sizes aren't standard, so you really need the ground glass back and holders that fit this exact camera, as nosmok said. These might be in the carrying case if one is lucky. Then you have to shoot plates, or put film in plate holders with septums (Are septums a standard size to adapt say 4x5 film to 4x5 plates? I don't know).