CHICAGO — Auction house Christie's valued bankrupt Detroit's art collection at between $454 million and $867 million in a final assessment turned over to city emergency manager Kevyn Orr this week.

Orr's office released the final report, dated Dec. 17, on Thursday. The figures were slightly revised from a preliminary report issued earlier this month by Christie's that appraised the reviewed works at a range of $452 million and $846 million. The figures are far less than the more than $2 billion estimate some city creditors have speculated the works are worth.

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