I had a mixed order for months at Creedmoor. One of the products came in stock, and I emailed asking if they would ship partial and they said no - I’d have to pay more shipping. I was told they would hold it until my other products came in, and ship altogether. Well, a few weeks later I get an email about the shipment being prepared, and within hours, I was told I was back on back order. When I emailed to ask, they said the first product was not at the warehouse.
My advice if you have a mixed order at creedmoor is to break it up, and pay the extra shipping. I don’t think they have the systems to support holding product for mixed order back orders that honor when each order was placed.