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Allan, you probably have more info than this link provides:
http:/en.wikipedia.org/wiki/White_lead
I thought this reference provided a link to another article that described the process, and noted that spent tanbark was used to bury the jars of lead buckles and acetic acid . . . dunno where that went.
The article stated that lead carbonate would efflorsece from the buckles with such abundance that sometimes it burst the clay vessels! All references seem to indicate that Carbon dioxide is a necessary atmosphere for the chemical reaction, rather than the introduction of carbonic acid (?)
Looks like a promising start!
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