Looks like the Bengals did try to claim cornerback Shaun Prater:
#Bengals had NT David Carter, DT Corvey Irvin, DE David King and DT Kheeston Randall in for tryouts. Also did try to claim Prater
— Joe Reedy (@joereedy) October 22, 2013
Alas, the Vikings were able to claim him, so the Bengals may actually play against him this season.