As a current museum curator, I am certainly hearing a lot of misinformation being presented on this forum as it relates to museum.
Firstly, legitimate museums cannot resell items that are donated to them by the general public. We have very strict ethical and legal rules governing the removal of artifacts from our collections. I would certainly be very interested to know if the museums being critized for selling artifacts are in fact museums at all.
Secondly, although I do agree that most material is not usually on display at any given time, but the fact of the matter is museums are in a sense "protectors of the past." It is hoped that the material they hold is there for my children's children. Frankly, I get bored seeing walls plastered with "stuff". This material is also valuabe in the research sense, and much of any museums collection is held for research purposes anyways.
May I make a suggestion, call and talk to a reputable museum such as the War Museum in Ottawa or the Military Museum in Calgary. These are the best-of-the-best for this type of material. And remember, it isn't just about the value of the item or the what the item is, it is the story of how it came about to get there.