Well, it might be so, I cannot say I've seen it in 15 out of 30 plays as I don't usually reload and havn't played 30 games, but ...
There is likely, at least partially, a major probabliltiy component to the distribution of who has what and how much. PLus, it may also depend on the grouping of civs present.
In my current game, there were originally 8 civs. I am the chinese. The French DO NOT have wine ... *I* have 6 tiles of it (All on hills). DO have silk but no incense.
Both the French and the Babylonians had dyes, 3 each. The English have ALL of the furs AND the gems, on a continent to themselfs from the git-go. The IRoquois have all the incense, and all of the spices. They may have gotten some of their hoard from the Indians whom they conquered before I made contact with them.
The Egyptians and the Greeks had the ivory split between them.