OtherEric

See, I figure this would be the key, because of the Simon & Kirby art and the Human Torch ad:

See, I figure this would be the key, because of the Simon & Kirby art and the Human Torch ad:

See, I figure this would be the key, because of the Simon & Kirby art and the Human Torch ad:

If we're going for the paperbacks now:

See, I figure this would be the key, because of the Simon & Kirby art and the Human Torch ad:

I'd agree with @RBerman - provenance is going to be tough with the original party not around to give any recollection of where the sketches came from. While it's probably easy to surmise they are authentic considering the source, the person buying it will now be once removed from the history of the art and then it becomes even more difficult to take at face value that they are authentic when that person decides to sell them.
Without any history or provenance at all, the cost of authenticating may not result in getting that investment back (except maybe for the Caniffs, especially the one dated from 1945). Also unclear if the auction houses would be interested in listing, but that's worth a try before you opt to put them on Ebay and let the market figure out the value.

Got a couple cheap “women in peril” covers yesterday. Just can’t go wrong with Belarski covers!

Got my second submission. Very happy with it. Also came back a bit better than I expected. Got it from Dave Smith years ago. My best grade Yakima. How often do you see white pages on a pulp?
This one also moves around in the slab due to the thickness. I contacted CGC and they noted that the process is new and they are working out the kinks. I suggested putting the thinner ones in a comic slab. 

The provenance of legitimate but unpublished sketches can be very difficult to prove. These types of works are the most easily forged, so prospective buyers like to see the sort of evidence that can be challenging to acquire after the original owner has passed on.

Schulz' art got shaky near the end but I don't think that it ever reached that level of degradation...
 
Nice Caniff!

Love that cover. My second favorite Super Science just behind this one.

I really like both covers on the Evil is the Night/ Dictators Die Hard double, I may need to put that on the upgrade list.

My second favorite Argosy Devil cover, although I probably am not familiar with all of them.
My #1:

I think this one came out twice as well:
 

And as long as we're showing the Weidman books:
 

And as long as we're showing the Weidman books:
 

I think this one came out twice as well:
 

I forgot that you posted a copy too 
 

YOU DID IT!  Or maybe Mike did it?
let me try:  Philip K Dick

And as long as we're showing the Weidman books:
 

I think this one came out twice as well:
 

If we're going for the paperbacks now:

this one is a little rough... but.

Here it is. Not as a high price as I recall nor as deep of reds:
https://www.comicconnect.com/item/1035370?tzf=1
Your copy has the better color, that one the better structure.