Not all agents do bar coding. Some of them simply collect the pelts and deliver the sealed bags to Stiught. The pelts are bar coded there.
NAFA has changed their tracking system for non-bar coding agents about 2 or 3 times in the last 8 years.
At one time the agent gave shipments a number based on the order in which it was received e.g. if you were the 23rd shipper on his route them he wrote 23 on your invoice and 23 on the bag tags. Every agent had a different colored marker just for them. This was meant to speed up the bar coding process in WI. NAFA is always looking for ways to stream line time consuming process such as the the bar coding.
I would bet anything the x on your tag is some way of making things run smoother on the warehouse end and has nothing to do with origin or section.