I wouldn't be concerned too much about it. I've had several packages rescheduled, including one that was a chemical order. All were just screwups on the shipper or sender. On my chemical order I was shitting bricks as I tracked it on-line, because it got all the way to town but then was sent back. I didn't want to probe too hard on the issue, so I waited and waited. Finally, it arrived about two weeks later. It turned out that the seller wrote down the wrong address for the place to where I was having it sent. So the whole order/shipment had to start over.