A matter of clarification. Block did appraisals for other collectors that I know at no charge and for items that they had no intention to sell. He was able to identify them, give rather a lot of detail on them, at no charge, so...
You can always try Block's Marble Auctions. They do grade marbles against their own standard and they have a high reputation in the field. I know some high-level collectors that sell through them. I and others collectors I know have talked with them about appraising some marbles and have purchased through them.
https://www.marbleauctions.com/appraisals
Totally a new box. I've seen them referred to as Fantasy Boxes. You can buy them readily, I've seen them for about 25 bucks on eBay. there's even a supplier who will custom print different things on it or offers different marble names on it like Master, etc.
I have read and heard several times that oxblood is confusing to newbies. Well now I can understand why. How can you have Blue Oxblood? Oxblood is blood red so it's supposed to be the color of blood: red. I've never seen blue blood and then purple oxblood and then other color oxblood?
When I asked that same question just a short while ago, I was also told that OP can mean "original picture" as opposed to what other pictures might have been added to the thread. 😃
I think there may have just been a little confusion here. The red on the OP is oxblood. The blue is blue color glass. I was misreading the original question, sorry for making that assumption. It is not blue oxblood but it is red oxblood on a marble that also has blue on it. So it is an Akro patch with oxblood and not an Akro Blue Oxblood IMO.
Wow. These stories bring to mind something someone said to me long ago that has stuck with me ever since: "It's great stuff when life gives you something fantastic to be tired from!" This sure ranks at the top!