If they smell at all like pine, they're no good. I accidentally used pine pellets for mine a few weeks ago -- didn't notice that they weren't kiln dried, and had a god-awful cold and sinus infection so I could't smell anything. By the time my nose was working properly again, the pigs had been on them for a week and already had the beginnings of bumblefoot.
I know you can air dry pine shavings if you open them, spread them out, and stir them around occasionally. But since the pellets are so much thicker, I don't know how long it would take them to air dry sufficiently to be able to use them.
I've emailed all the pellets suppliers I can find, trying to find dried ones, but haven't gotten a single response. I guess they're only interested in communicating with the stores that buy from them.