I did buy this rubber perhaps 4 or more month ago and let it sit in the drawer unopened. When I glued it on and removed the protection foliage I instantly tested if it was sticky and it simply was not. So I would discard the possibility that I cleaned it wrong and removed the stickiness that way. I got this butterfly cleaner solution which I use and thatv did not harm the stickiness of PK50 nor Rakza Z even after several month.
It didn't sound like you had done anything, but you have identified where my suspicion started. The fact that it was virtually a non-tacky sheet immediately after peeling the vacuum seal, suggests it might have been faulty. Logically, the final process in manufacturing is likely the application of the adhesive layers and vacuum sealing. These should be low-risk processes which are likely sampled during production for QC purposes, rather than having someone check every single one (they likely do this per larger sheet for mechanical properties, before the final process).
I'm not suggesting that I know this to be fact, I'm simply relying on my own experience with certain companies and applying some additional logic, so if anyone has explicit knowledge of the process and I am in error, please let me know.
In case it wasn't clear before, straight out of the box, mine could pickup a ball, no trouble at all. In fact, I could pickup and throw the ball into the ceiling. Battle 2 Provincial could do this as well, probably even more so as it is tackier than B3. I can almost do this now, even after 90 hours, but not quite so forcefully. My other sheet, the 39 I had on a T11S, was identical in how tacky it was new and just before I sold it (after 25 hours).
It's quite possible that your sheet just happened to be defective and that's really unfortunate. It might be worthwhile contacting the seller and letting them know. You probably won't get anything for it, but it can't hurt to let them know, in case it happens again.