If it's not a pre-sale definitely ask. Be nice about it because if a seller thinks you might be a problem, they might block you (I read about it all the time on Seller Central). If it doesn't say pre-sale, it could be someone who is new to selling who doesn't know they have to list it as a pre-sale. So, a friendly question should get you the answer you want. If it's an LE pre-sale, keep in mind there is no guarantee they will be able to get the pin they are advertising. I see that happen a lot.
A long time ago when I was not so savvy about pins, I bought a complete set of lanyard pins that were brand new to me (in terms of I've never seen them before), so I bought them really fast. Turns out they were lanyard pins that were about to be released but hadn't been yet, and they were scrappers.