I've Ben lurking here for a month now reading up on all the great info so I could start a habitat. Well yesterday I set out to purchase everything I needed to start my tat. See the plan was no crabs just the tank and all the items. Well I hit wall-mart to pick up my tank because they had some good prices. So I grab my tank off the shelf and turn around and all these little plastic cups catch my eye. To make a long story short it was rescue time and I just had to buy the poor little guys. No food or water and one even had a broken shell. I rush home boil everything and clean it, running around my kitchen like a mad man trying to get everything ready. I think I have to dig my self a hole now and distress. But here are the pics of the gang.
This lil guy spent a good 6 hours playing in his salt water pool.
This is the one who had a broken shell. As soon as I turned my back on him to go grab some food he did a quick change into a new shell.
This little goof likes to sneak up on everyone siting around the pool and push them in. Then he runs off laughing back into his cave.
My camera shy crab.
If anyone can make a guess of there species for me it would be great. I have partial color blindness and some of the tricks using colors and such are throwing me off LOL!
I'm a new crab owner too and I know how you worry about setting up everything for them. I'm surprised about the place you bought them from. No food or water? Those poor babies. 
But at least they have you to take care of them now. Good luck!