Found interesting (rare?) car at swap meet

Okay I got a response from the seller. He sent me an email, I'm going to just put it down word for word:

"The 'Miss Mighty Mopar' Duster was made by the Ertl Company. 15 cars were made and this is #3. They used the Cox 1/2 A chassis and .049 glow plug engine. It's an inline tether car. It is heavier than a model of it's era and was likely made to sit on a shelf and just look cool for years rather than run down the street. Having to clean fuel off of this piece would be shameful.
It is is mint condition. After doing more research and realizing the rarity of the car, I am motivated to consider offers starting at $1,000.00. Shipping will be done through USPS at the buyers expense and it will be packed like a new born baby. I will be repacking my sale items and will take several more snaps to send to you soon. Thank you for your time and consideration and I hope it sells to a Mopar nut very soon.

I will say he offered me a $25 dollar "finders fee" for locating a seller, I would just as soon pass that on to the buyer. I really don't know what documentation he has or the authenticity of this piece, I did see it and it doesn't looked cobbed together. I'm enclosing the business card he gave me, if you want to contact him for further info I'm sure he won't mind. If he sends me more pics I will post them. I'm a little surprised by his increase in price, but maybe this thing is that rare, I don't know.