Finding out how much $ his old truck sell for?

Is there any way to find out how much a dealership sold my boyfriends old truck for? He had it repossessed a couple years ago and Chrysler is trying to Garnish the full $26,000 he bought it for. They shouldn't get a full $26,000 from him plus whetever they got for it from the next buyer. Any ideas? Thanks in advance!
 
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