I was looking at the photo's and did not see 10,000 to 15,000 in value. That being said what I see in the photo's. There are some intakes off of cars in the one photo, so maybe there is more of that stuff sitting around.
The die cast stuff you will have a hard time giving away from what the sellers at shows have said. As far as her value she has in mind, more power to her to know there is value. She does need to get a few tables at the Kalamazoo toy show coming up.