Thank you for your questions, @GwenLittle and apologies for the delay!
Sales Reports: To identify products with no sales, you can utilize the “Sell-Through Rate by Product” or the “Average Inventory Sold per Day” metrics. Both of these can be found in the Inventory category under Analytics → Reports. Please note that there isn’t a specific report available to highlight products with no inventory movements.
Flow Notifications: To ensure the notification includes the specific variant it is alerting you about, make sure you are adding the variant name/id into the email as a variable. You can follow this video walkthrough for instructions: Video Walkthrough.