Hi - it wasn't until I saw Mike's response that I realised the depth of information on your post. Having the ARN transcribed as a telephone number threw me. Collating both yours and Mike's information gave a clear picture. One question though is, is 1505 the VIN of the truck with 171446 being its ARN.
I rang my friend with all the available information and he was very thankful. It gives his truck a good provenance.
Bob