Some Pet Rat Questions and Help?

So I got two male rats form the local animal shelter. Oreo and Snickers. They are both six weeks old and litter mates. I got Oreo the day before because I didn't know they would get lonely with just one rat. I went back the next day and got snickers. The shelter put him in a large hamster ball for the ride home and I noticed he was sneezing. Oreo was fine I never heard him sneeze. Anyhow after I put them in the cage the next day Oreo was sneezing to. It’s not all the time but it is a couple times ever hour or two. I have been researching upper respatory infections and I know that they are contagious but they don’t have another symptom besides sneezing. They both have clear eyes no discharge no runny nose no patches on their skin or anything. Also the closest vet is about 80 miles away. I have only had them three days. Do you think it’s just a little cold or something serious? Please help I’m already worried about losing them. They don’t use cedar or pine bedding because I know that isn’t good. They have aspen bedding the same they had at the shelter.Also what do you think of this cage. http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=23204 I know it should be big enough for two male rats. Shoud I get it for them. I know the one their in now needs to be a bit bigger its only one story.