Take one to a pharmacist. Free, two minutes, correct. Everything else here is a hypothesis.

Silent tracking in the first week is normal. Scanning happens at hubs, not continuously.

Sorry for the basic question, but how do you actually start one of these diaries?

Three questions kill most of the confidence in a thread like this: sample size, blinding, who paid.

Followed, this answered three questions I had.

Split orders. Two small parcels beat one large one for reasons that have nothing to do with price.

This is the kind of post the forum exists for.