Somebody is running a script on our site and abandoning lots of baskets. Why?

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Looking at abandoned baskets in onne of our apps we can see dozens of abandoned baskets for silly large quntities of products. This appears to be happening every 24 hours. It must be a script because the unusually large orders that are abandoned are the same each evening - they are typically 20-50x our AOV.

Why would somebody be doing this? What is the value in doing so? We do have a competitor in our niche that has a habit of using black hat methods (Including cloning another competitors website and just changing the logo and contact details when they launched!), but at this stage I have no idea whether it is them or not.

Any suggestions or insight appreciated! What tools have I got available to figure out where this traffic is coming from?