Wait a few days, then get out there with your metal detector. It's near impossible for them to recover every single loonie and toonie even with that magnet crane. With any luck (or many lucky loonies) someones gonna have new scanner money !
It happened at 4am on a remote part of the hwy, chances are high that not very many people even had the chance, it would have been secured well before traffic picked up. That vehicle in the accident would have a gps monitor and a few other sensors to notify the powers that be that an accident occured. Reponse would be expedited due to the nature of the 3-5 million bucks on the truck