Speaking from experience, the stock pictured in the first post is a prime example of being a short-shot (mold under-filled) this can be caused by the mold not being hot enough; the hot-runners being under temp; holding pressure too low; holding time too short; possibly shot size to low.
My guess would be that if it was sold, it would have been sold as a "second".
The original poster was asking about value; I would say not much. Fill it, clean it up, paint it with epoxy or a ceramic coating and put it on a rifle; it will be worth more that way than standing alone.
BTW, to have a new mold built today for a single cavity mold, $250,000 - $300,000 would not be out of line; then you would need a press for that rather big mold new would be $500,000; or farm it out to an injection molding company. The second would be the most economical. So how many would you have to build to sell them at a decent price and make money? Likely 50,000 units.
When we see economical rifles with composite stocks; just think how many they must be selling world wide to cover the tooling; likewise, this is why designs don't change that much. It is easy to change the program to change the design of a CNC cut wooden stock, but the cost is in the finishing; With thermoplastic injection it is costly to change a design (mold repairs for a single feature usually cost $2,000-10,000), but finishing is easy; just change the resin pigment to change the colour. 2 stage injection, and overmolding would cost more.