Are your nomacorcs plain or do they have company writing on them?
The bag of 1,000 I purchased is from Vinventions, the Nomacorc distributor and the bag says Select Green 900. These are 1-3/4" and are plain, no writing.
All the ones I've purchased in the past are 1-1/2" and have a grape bunch printed on opposite sides of the cork.
Here is how bad my nomacorcs are indenting. Seems a bit much imo?
I get a small indent that disappears other than a small mark after a few days. I have the blue Italian corker.
My niece purchased 30 count bags from a LHBS (Syracuse NY area) and a few corks produced really big dents with a double-lever corker. She later purchased the red Portuguese and has no problems now.
I've been using the 900s for a couple years with a Portuguese floor corker and have never had denting like that. The Nomacorcs from LD Carlson don't say what they are other then Nomacorc and the size. No number designation. On the website, LabelPeelers says they're good for 2 years in the 100 bag description and 10 years in the 1000 bag description. Confusing at best.
I downloaded the PDF spec sheets, which hadn't been updated in a few years. It wasn't clear and took a fair amount of hunting to discover that Vinventions distributes Nomacorc.
IMO the identification problem has numerous sources -- one is that Nomacorc makes numerous lines of corks. The second is that they don't keep their public documentation up to date, and if they do update it, not all locations for those documents are replaced with new spec sheets. A third is that LHBS are not paying attention to what they are buying and selling, as it's complicated.
On top of that, Nomacorc is a big producer for commercial wineries. I doubt that home winemakers are even on their radar, so they pay no attention to us.
Buying a 1,000 count bag worked fine for me, as I'll use it up in a couple of years. But for folks who make a few carboys a year, buying a bag like this is insane. I supposed all we can do is identify the LHBS who are paying attention and point our members to them.