The Quest 3.0 (559) was $1995 in 2014. It's been discontinued, replaced by the QX100. Same frame and wheel size, different color, the DualDrive and single 42T e-ring replaced with a 34-48 double crankset. The QX100 lists for $1749.
$1995.75 new 5%-10% depreciation per year is 15%-30% = $300-600. The value of the totaled bike $1695.75-$1395.75.
If you look at the Market Place forum you'll see that the used bikes priced at 5% per year depreciation sell fast; if they are computed at 8-10% they last a day maybe 2. Your best bet to prove value is to print out some of those that were advertised here and marked as "sold" that have prices listed. Avoid the Craiglist ones as those tend to be sold by people that don't know what they are worth, and it's not something anyone around here is going to tell them, why wreck a good deal for tribe members.