I've spent an hour researching this forum and an overwhelming amount of posts have been written about the (in)ability to export orders with MarketPress.
I have not had success getting line item detail from any of the suggested export plugins recommended in those other forums so am opening my own support thread asking for help on export order details.
If there is not a solution built into MarketPress on the horizon (in the roadmap this year), I will be moving the client to WooCommerce
That is not a threat and I do not mean to be brash. It is just really eye-opening to see this lack of functionality. I assumed it was present, so it is also my blame for rushing into using MP without considering that.