I agree with revenuermd. Here is the instructional paragraph on a Minnesota license:

An entire 1949 Minnesota license showing where the hunting stamp was typically applied. No doubt some hunters applied the stamp to the back of the postcard 1/3, or returned the entire license enabling the hunting stamp to get a postal cancel.


A 1950 license:


A 1951 license:


Louis was apparently a very poor hunter or a very poor reporter of his annual bag! His poor skill is our good fortune today.