You can easily filter those orders where the customer has accepted the post purchase offer by added tag.

You can set your own upsell tag in settings which you want to add in order when the offer gets accepted in order, so that you can find it easily in the shopify panel itself, no need to open the app each time.

To configure the tag, find the settings menu from the sidebar and find the option for order tag.

Add tag and save the changes, by default the tag is : WIZIO_UPSELL