Cool box. I have never seen anything like it. I assume no company or manufacturer name on the box. So, it'll be what someone wants to pay for it (or wants to sell it for).
I lean to Pelt as, I think, as Steph mentioned, the ends of the ribbons on a Figure 8 come together. But, as in the upper left couple in this picture that Winnie had posted back in 2010 of Figure 8's - .....?
A little add-on here. There are marble collectors (sellers) that do come to the show only and that is the only time you will see them. There are deals to be made. Plus, there are local people that come by with their marbles (from their folks, grandfolks, barn finds....) wanting to sell them. Many good deals have been found.
Jobber boxes is correct. Could be filled with any marbles although Champion is one of the more common types that you will see in them. That is what I think are in the one box. The other was probably used to store someone's "other" marbles - neat German handmade in there. By the way, WVS means West Virginia Swirl.