Chlorides, like bleach, are pretty hard on stainless steels. High concentrations, high heat, and extended exposure times can in time pit even quality 316 stainless steel.

The manner of corrosion, pit corrosion, works in a way that makes metal thickness far less of an asset than it might otherwise seem. Even steel several inches thick can develop pinholes in shockingly short amounts of time.

http://www.cip.ukcentre.com/rust2.htm

Stainless steel containers that corrode in high concentrations of warm bleach may not be otherwise vulnerable to corrosion and may not be deemed defective or substandard given that they might give acceptable service as long as they are not soaked in bleach.

The same sort of narrow vulnerability may be seen in copper dishes to food acids and aluminum pots to copper.

An old dirty trick to sabotage a aluminum boat hull used to be to flip a copper penny into the bilge. Water and galvanic corrosion can produce a penny-sized hole in a shockingly short amount of time.

Point being that the aluminum boat hull may be extremely high quality otherwise but it is a known and accepted vulnerability of the material itself.

I would suggest that you might give these presumed low quality stainless items a shot in non-critical use to see how they hold up.