Considering the low volume I would say all. If you see 67K on the ask and you put an order in for 67K, you will (depending on other others) get them shares, that does't mean the 67K will change. If you didn't get your shares and they were available to purchase at the time you put your order in, then you would call your broker and they would most likely find they were available and you would get them at least that is what happened in my case once before!!