If you say they will, then I'll believe. I just have always found the smaller plants are, the more delicate they are. I think my wife would kill me if I 'adopted' anymore plants. lol. She probably sees more than she wants to already.
I said it because I've mail ordered plants before from CCN and TheChileWoman There were a couple small ones in the bunch once and they struggled a lot compared to others. The roots were more delicate. I would guess the biggest issue would be how much soil the seedlings have to avoid drying out/shock.