Why the sample and the shipment differ
A trading company sources your sample from the best workshop it can access, often having a senior craftsman make it by hand. Your production order then goes to whichever workshop has capacity at the price the intermediary needs to protect its margin.
Nobody has necessarily lied to you. The intermediary genuinely does not control which hands make your product, which is precisely the problem.
The five questions
One: which specific machine cuts our profile, and can we see it running? A factory answers immediately and turns on a camera. Two: what happens to a bead that fails inspection — is it reworked into the batch or removed? A factory has a policy and a scrap rate. Three: can you show us the inspection record from your last order for a different client, with the client details redacted? A factory has records.
Four: who braids the tassels, and are they employed by you? Five: can we schedule a live video walkthrough of our order in production, unannounced, next Tuesday? The word "unannounced" does the work in that sentence.
What a factory relationship gets you
Repeatability, primarily. A documented production file recording material batch, tooling, finish profile and inspection results means a reorder in two years is executed against a record rather than a fresh interpretation of the brief.
You also get engineering feedback. A manufacturer will tell you which tolerance in your drawing is unrealistic for a material at 2.0 Mohs, where a construction will fail in transit, and where you are spending money on a detail no customer will perceive. An intermediary passes the drawing through.
When an intermediary is fine
For a one-off promotional run at a low price point with no repeat requirement, a good trading company is efficient and there is no reason to avoid one.
The moment a programme needs to repeat, carry a brand mark, or survive an audit, the calculation changes completely.