Answer:
Fingerprints, manufacturer information, and make/model
Step-by-step explanation:
The glass recovered can be used to identify the make and model of the car, manufacturer information, and if they're lucky, fingerprints. Different companies whom make cars use different materials. Corvette glass is very fragile and is known to completely shatter on impact whereas a Jeep Wrangler with gorilla glass is going to be a lot more different in materials, and probably not going to shatter the same way (if at all) either.