I boxed up my collection of Hot Wheels and other diecast and scale model cars about 35 years ago! I saw them again about 20 years ago when I moved them from my parents house to my home. Today, I dug them out of the storage closet.
Here is a box of loose vehicles.
There are at least 4 Redlines visible and more buried underneath.
I have for a long time thought that this collectors case was a Hot Wheels product, but as you can see it is from Matchbox. There are three layers of vehicles and it holds - I believe - either 45 or 60 vehicles. Most are Redlines, if I am recalling that correctly. (Update - all of them where Redlines! 6 empty slots from a total of 72 total.
I know I started collecting sometime in 1968 and did so through '71 or '72 (latest one was actually from 1976). More pics to come as I sort through the loose box and open the case back up.