Customers who place individual orders on multiple free shipping items

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Going though my orders tonight and I happen to catch 3 customers who placed multiple individual orders for items with free shipping.

Basically a customer buys 3 different things with free shipping with three separate orders when they could all ship together.

I was lucky they were all right in order and I noticed the same name 3 times in a row. Shipping addresses match.


Other than getting lucky and catching it, is there a way to flag these or does anyone have a system that works ?