Hi Broomhildah, I think in your zone you could have easily had success overwintering tubers in the ground; not just that particular burgandy variety. Freezing and too much moisture are about the biggest enemies of tubers left in the ground.
It will probably be impossible to tell exactly what that particular bloom was but you might get lucky. A starting point would be to identify what form and size your blooms were. Check the link below, it has examples of each dahlia form. From there, you can check lists at www.dahlias.net It has photos by size/shape but there are only a small percentage of all dahlias pictured there. If they were bought in a retail store,they are likely not pictured there, but maybe. Someone here might very well have bought the same package as you and remember the name.

A photo of your bloom posted here would be a good start too.
There are thousands of other dahlias to choose from and I bet you could have equal success starting over anew.

Here is a link that might be useful: Examples of dahlia forms here