This is what the RealReal does: It gives another chance at life to secondhand Chanel flats, Prada backpacks, Burberry trenches. When it went public last year, the luxury consignment company was valued at more than $1 billion.At the RealReal warehouses in Secaucus and Perth Amboy, in New Jersey, there is a backlog. Used designer clothing, handbags and all manner of accessories are waiting to be inspected for authenticity, photographed, then packaged and shipped when they’re eventually purchased online.