This is common among the recont prefixes. I am trying to figure out some logical order for this, but to no avail. If the banding is from the BOC, I would lean towards that they were not pilfered. If they have any marking of a bank, such as a stamp on the band, then they have been handled before.
There is some interesting stuff about this in some of the insert posts, FEP Hi Low for sure, and some of the other recent $5 High Lows.
Hudson