God, I have to go way back to the late 80s early 90s. I'm going to have to say a Racing Champions 1/64 Gift set. Don't have the box anymore but still have the cars & cards. As well as the display stands which was a piece of plastic that fit between the four wheels so it was raised a bit. The years ranged from 89 to 92 or 93.
The cases I put them in, I was just adding some cushioning at the top to prevent them from them landing on their side last week & labeling so I could store them in the basement in their own box. (need the shelving in the closet.) All the loose ones go up to 97. 98 was when I started KEEPING them in the original packaging.
I should take photos of them. Fun fact, Penskie wasn't always Dodge & Ford, at one point, he was GM Rusty ran a Pontiac.
Those took me back to when I was younger and I used to carefully race them around on the living room floor. Line them up, and one by one I would actually be on my knees going in circles. It was amazing how much dust I picked up from the carpet that accumulated on the back of them. Fun times. Don't think my knees can handle that abuse anymore!