Me too. But I already have one like this. They seem to come to the light more often now.
There is currently a similar but jounger set on ebay - priced even more...
You are very right. These days prices seem to explode on Blackhawk sets from before 50s.
To your missing pieces:
I have one universal 3/8" that I need myself and spares/doubles only 7818S and 7820S
The 7814S I am missing too.
But I have one 6618 socket. Oddly this comes with a release button...
Ahh, here went the nice set that just lately showed up on ebay. I recognise the chip in one socket... Great find and buy! He shurely was not right in describing it as 1" drive. Too sad that the handle bars were gone.
Great set and an awful lot of work in those huge lots. Looks like you have two of the 9004 socket release tools. If you ever could think of letting one go - I would really love to buy it for my set.
Wise words...
But it is still very hard to find gems these days when you type in "blackhawk tools" and not half of the results are blackhawk and the rest aint even tools...
For those of you that still want one of the non baldy and like digging into piles, take a closer look at this lot:
https://www.ebay.com/itm/267101398768