I asked three customer services and they gave me the answer below.i believe you still can request the dustbag, they must have it somewhere
1. The vendor provide us only with a certain quantity of dust bags and unfortunately, sometimes we are unable to send it for all orders.
2. I do sincerely apologize some items are sent with a dust bag but not all of them.
3. Our records indicate that this particular item does not come with a dust bag.