Thomas Pilaar, 33, was suspected of using different names to obtain seven library cards from the Denver Public Library, then checking out 300 items per card and selling at least some of the items, KCNC-TV in Denver reported.
"It appears his intent was to sell 2,100 (items) from the Denver Library collection," Denver Public Library spokeswoman M. Celeste Jackson told the station. She estimated the losses at about $35,000.
Arapahoe County library administrators told KCNC Pilaar obtained three library cards and checked out between 250 and 300 items.
James Larue, Douglas County's head librarian, said Pilaar checked out more than 300 items from two county libraries and had $11,000 worth of overdue items.
