Received the following message from them, and subsequently received one box of 100.
Message from seller IDM Products LLC:
Hello,
We understand that you ordered this item and need it prospectively, but the item is out of stock and is on backorder with the manufacturer at this time and we don’t have an eta as to when it is going to be in stock, unfortunately, you would need to cancel this order.
Again, our apology for any inconvenience and appreciate your business! You will not be charged for this item.
Best regards
IDM Product Customer Support
CR