I don't either, but C&S does.

But I usually print thelabels as I'm on my way out the door to post.

I don't send copies of invoices with the items. I can't see the point in wasting that much paper and ink. The buyer has the details on their computer, which they can print if they want.

Never had anybody ask forone yet so, for my items, it seems people don't need invoices.