I may be waaay off here but what would you estimate the buck / doe ratio is where you hunt? Doe will certianly scrape and since they don' t have antlers that could account for the lack of rubs. Not to worry though. If this is the case and it may not be, the bucks will be looking for does and should be around. It may just be the does severly out number the bucks as is the case where I hunt. I also fine scrape lines w/o rubs. It' s not the norm but definately happens.