After going through the packing slip I almost ordered some rather expensive items because I thought that I forgot to order them. Some further investigation turned out that the said items were indeed ordered originally but the back ordered items did not show up on the invoice or packing slip as being back ordered. After questioning Digikey their was their reply:
"After we hung up, I realized you were a Canadian customer. The back orders will not show on Canadian orders crossing the border due to customs. We can only show what is shipping on the invoice for tax purposes. You stated that other companies show the b/o's, and if you order from a company within Canada, they probably would as nothing crosses the border. On all US domestic orders, we do show the b/o's. I did check into this just to make sure and they verified that this is correct. If there is some information you are aware of that would help us in resolving this, please share and we can look into it as we would love to make things easier for our customers. Please contact me with any further questions."
I find it rather perplexing the Digikey cannot show on the packing slip those items that are not being shipped.