Where did these come from?

I don’t think I know of any company who uses a distributor and then tells the customer who their distributor is. The job of a tea company (that uses a distributors) is to source the tea and resale it for a profit; it doesn’t make any sense for them to tell you who their distributor is.

Gemstone distributors aren’t really a good comparison because the stones aren’t the final stage product. Making jewelry you use your time/skill/artisanship complete the product, whereas tea merchants sell the tea just as it is from the distributor.