I got this old female as a Russian Rat snake, but I have not been 100% sure. She's really dark, and the yellow bands that they are supposed to have, hers are really thin and faded to a point where they are barely seen. Her face looks like one, but everything else I'm not so sure. She's about 4.5' long and her belly is completely black with only a couple white speckles. Do I really have a Russian rat? Help?