All I'm getting is offers for empty boxes? NOBODY on this site has any OS full boxes for sale...I thought for sure I could find some here because none ever come up on eBay!!!
They really don't grow on trees. For series 4 and earlier, there has never been a full box on ebay to my knowledge. At one
point I owned 10 full boxes, and not one of them was purchased on ebay. Almost all of them were obtained from long term hobby
connections/friends by being in the right place at the right time. Other than the most common series (7, 10, 14) which do come up on ebay now and then, that's pretty much the only way to do it.