Why do dealerships lose/destroy vehicle records?

[NTIman]

I know at the dealer i work at, i think they threw away a ton of records like 5 years ago, because they were old, no one customers had the cars anymore, and it took up a lot of room in filing cabinets.

As far as records on the computyer, i'm not sure, i think we use different software than they used to, so i doubt if theres anything too old on there.