Dave - You might want to look at

Adams, Diane L.
   1989   Lead Seals from Fort Michilimackinac, 1715-1781.  Archaeological 
              Completion Report Series, Number 14.  Mackinac State Historic Parks, 
              Mackinac Island, Michigan.

Lynn Evans
Curator of Archaeology
Mackinac State Historic Parks
[log in to unmask]

>>> [log in to unmask] 01/02 8:08 PM >>>
I am currenly analyzing a collection of early 19th century lead fur bale
seals from Castle Hill, the colonial headquarters of the
Russian-American Company.  These seals (similar technologically to those
from ancient Roman and Byzantine context) were embossed with secret
codes to indicate the source/quality of furs.  They were then used to
secure and tamper-proof the bales.  My question to the group is:  Was
the use of bale seals standard practice in the fur trade?  I know that
they were used in the textile industry -- and probably others -- but I
am interested specifically in finding analogs/examples in the fur
trade.  I would appreciate any insights.  Thanks.

Dave McMahan