Is it OK to re-use attic vents once removed? Can a contractor re-use exhaust vents if the insurance company is unwilling to pay for brand new vents?

Air Vent does not recommend re-using vents after re-roofing.

Air Vent does not recommend re-using vents after re-roofing. Furthermore, shingle manufacturers (Asphalt Roofing Manufacturers Association) also recommend installing brand new attic exhaust vents on the roof anytime new shingles are installed on a roof. Removal of vents often causes the vents to become damaged and/or unsightly. Most quality roofers would not even consider it as an option.