I'm so excited I figured this out immediately! I guess that's what happens when you have quite a few military family members! I didn't ask them for advice though like you suggested - I just used my head!
I will be traveling the 8+ hours up there on Wednesday to Green Bay and plan to travel up here to find this cache. I hope it's in good working order - it's pushing 9 months since the last log. I'll report back to you on its condition!