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First trick: Find several identical sets sold under different brands, where only the case colors and branding are different. That means multiple Chinese merchants buy the same stuff and have it branded for their brand. That means it’s good stuff.

Second trick: If several people sell identical sets, the cheapest one will be the best. (I know this is counter-intuitive.) Because the low-price seller sells a larger volume than the others, they will have their act together. Someone selling the same set of 2x the price will know it's missing a part or two, and expects complaints and returns, which they have priced into the cost of selling it. I think there's a cultural thing where the Chinese mark up damaged items instead of marking them down.

Third trick: Know that the tools are designed to barely live past their return date, so buy ultra-heavy-duty for cheap. Here's an example: A cheap Chinese socket set will be barely strong enough to last a month of light use, but a cheap Chinese impact socket set will be barely strong enough to last a month of impacts. That cheap impact socket set will last a lifetime if used with hand wrenches, so that's what I buy. I can get a nice Chinese 50-piece impact socket set for $35 (1/4" drive) or $45 (3/8" drive) that will last me a lifetime of working on things that break with my hands.

Fourth trick: Trust your marketplace and resellers, not the manufacturers. A good reseller will test something before stocking it and will stop selling things that get returned. I trust AmArtisan, SwanLake, Horusdy, and others on Amazon who put their name on generic Chineseium. (I doubly trust them when they are all selling identical tool sets with different branding.) This is different from American brands where I trust manufacturers like Ryobi regardless of who is reselling their tools.