Another builder posted a question on the Yahoo RV-7/7A group regarding some scratches that looked like de-burring marks that were on the main spars and center section assemblies.  I went out and looked at my wing kit as well and I also have the same de-burring marks as the other builder.

The pictures below are the scratches I observed on my wing spars and center section:

Below is Van's response to reviewing the de-burring marks on those assemblies: