Oh me too. 
This went from Fun to Bummer real fast, sorry about that 
You may find this posting, where I use art stamp laser polymer, to be of interest:
Although I did buy some laserable rubber from the same source, I still haven’t tried it. I like the relative cleanliness of the laser polymer in the machine. It vaporizes the polymer and ends up not leaving much residue on the stamp (there is some, you can rinse it off with soap and water).
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Clever. Lots faster too 
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Due to pure luck & coincidence and… charm maybe? I met a cool lady at Denver Comic Con several years ago who runs a small lasery business in Denver(I was selling comics at possibly my first or second time exhibiting at the con).
We’ve chatted off & on over the years and i DM’d her yesterday to see if she knew a place that had any laser rubber in Denver.
“No,” she said, “But I have loads of it.”
One hour-plus round-trip later and I’ve got 4 sheets of Low Odor Laser Rubber to experiment on! 
I thanked her profusely and last night I was able to figure out settings that made a usable stamp.
Pardon the crass results(blurred for rude words)
I would guess it’s from the same place as you ordered yours from @cynd11
Now I’m waiting on the real deal to go.
Here’s the settings that made a successful stamp last night.
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The low odor rubber is pretty expensive at rubberstampmaterials.com, about $20 per sheet not including shipping. I found it cheaper here:
5x A4 sheets for $49, free shipping:
https://smile.amazon.com/Laserable-Rubber-Stamp-Engraving-Machines/dp/B01MAT50B6
$11.69 per sheet at a couple of places, not sure of shipping.
https://www.johnsonplastics.com/premium-low-odor-laser-rubber
https://www.signwarehouse.com/p/8-14-inch-x-11-34-inch-sheet-of-premium-laser-rubber
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Thanks @aj_stewped and @GrooveStranger! Nice to have a starting point. Now, if I could just find a cheaper source for the art stamp laser polymer…
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