calm down! just snap some pics when you can and upload them when you have a chance!
It could be a case of fin rot but i doubt it unless the water quality was that bad, but i dont think you would have bought it if this is the case. If the silver was with other tank mates it could have been bullied and the fins suffered. Fins do take some time to heal so if your water parameters are good it should heal rather quickly. (about a month or two depending)