First of all, we check the supplier's website. If the site was registered less than a year ago, we consider such a supplier unreliable and reject a deal.
Next, we check if the product at the supplier matches the product on Amazon (model, outlook, number of units).
Then, we check that the deal’s COG is the same as the cost of the goods at the supplier.
If a deal is a set, we compare the quantity of goods in the set on Amazon and at the supplier. In this case, deal’s COG must correspond to the quantity of goods in the set. We calculate it based on the quantity of units on Amazon.
Next, we check if the supplier has the items in stock.
We also consider Keepa charts on Amazon. We make sure that there are several FBA sellers in the entire sales history. We make sure that the name of the product brand on Amazon doesn’t match the name of the product seller. If the brand name matches the name of the seller, then it is most likely PL (private label).
However, we cannot exclude to 100% that the item is PL.