Aside from reading reviews from LAZADA and SHOPEE, there is a more effective way when shopping online.
To make sure you are buying from legitimate sellers, you should check out LAZMALL and SHOPEE MALL.

LazMall is a curated selection of leading international and local brands, top-rated online brands, and authorized brand distributors. Shopee Mall is a by-invite-only premium retail space reserved for brand owners and authorized distributors. Mall products have a label on the shop’s profile page and all of the shop’s product listings. Other legitimate sellers are those with LazGlobal labels. A LazGlobal Seller is a registered business on Lazada from China, Korea, or Japan.

Here’s the link for LAZMALL and SHOPEE MALL.

In LAZADA website or app, search for your desired products then below the label “Service”, check the checkbox beside LazMall and/or LazGlobal.