Hello @Seller_dFmw2NIX7oHa3,

Thanks for posting to the Forums. You will find more details about "bought in past month" in the Sales Trend FAQ page. Sales trend helps customers differentiate products in Amazon’s vast catalog by providing a broad estimate of the number of customers who recently purchased a product (for example, "10K+ bought in past month"). Sales trend data is refreshed at least daily and does not include returns and cancellations. Sales trend cannot be turned off, and helps customers make more confident purchases, which can help drive an item’s popularity and visibility in search rankings.

Regards,

- Manny