Locate Used Tahoe

We turned in a 2005 Tahoe on 8/27/08 from a SmartBuy contract to Snell BPG in Dallas TX. We're interested in repurchasing this vehicle. Is there any way to locate it? We called Snell and they stated that GMAC picked up the vehicle just a couple days after our transaction. We tried GM Certified's web site, but you seem to be limited to a zip code search within 250 miles. We called GM's customer assistance line and they referred us to GMAC. After waiting for GMAC over 35 minutes we hung up. We tried Car Fax but last entry they have is from the Texas state inspection in 2006.

VIN # 1GNEC13T25R181380

Thanks for any insight.