A customer picks up the phone, orders a Keystone $2000$ computer, and gives a credit card number. Presently a plain shipping box arrives, with only an address label and fragile warnings on the outside, and containing on the inside the Keystone $2000$ computer and a list of terms, said to govern unless the customer returns the computer within $30$ days. One of the terms in the box was an arbitration clause.Rob, the customer, kept the computer more than $30$ days before complaining about its components and performance. Rob filed suit in federal district court in the Seventh Circuit, arguing, among other things, that Keystone had engaged in mail and wire fraud, and that the ProCD v$.$ Zeidenberg Seventh Circuit Court of Appeals decision only applied as binding precedent to software, not computers.Keystone asked the district court judge to enforce the arbitration clause, and not allow Rob to bring his suit in federal district court. The judge refused, writing that $[$t$]$he present record is insufficient to support a finding of a valid arbitration agreement between the parties or that the plaintiffs were given adequate notice of the arbitration clause. Keystone, relying on ProCD, took an immediate appeal to the Seventh Circuit Court of Appeals.What result?