You are doing very well considering the shrimp came from such extreme water. It can be difficult to tell bloody mary from good coloured normal red cherry shrimp. I have just checked the last lot I bought, which I thought were bloody mary but when I looked up the order they were actually just high grade red cherry, so may go for those again when that time comes. Even with just one type of shrimp they will throw out lower grades and then revert to boring wild type unless you are very diligent with removing inferior quality ones regularly. Not that that is something you need to even start thinking about at this stage. Hopefully you will start getting shrimplets soon. As you state, I don't think bloody mary can have the stripe? At the price you paid whatever they are they are good starter shrimps. The bloody mary you shouldn't be able to see through the shell and the colour is solid, not broken up/speckled.
Keep up with the good work and lets hope you start getting shrimplets soon.