Deek, When I had my encounter in Scheels, they were unclear with their employees about the mall policy. The internal mall policy is no weapons. Scheels, and all the stores like it with external entrances, can make their own policy. So yes, you can carry in Scheels, but I do not recommend trying to go through the mall as it is posted and you can be charged with trespassing. Scheels management said they were trying to work with the mall to clarify the signage or to change the policy all together.
I hope this answered your questions.