Daniel still suffers from the belief that museums do, or ought to, purchase art from artists, that museums are somehow in the business of discovering artists.
The fact is that every museum on earth receives great masses of donated "Art" every year, and even more offers of "Art" and they turn virtually all of them down. A museum essentially is its curatorial vision. They have curators whose job it is to acquire work that fits with that vision. If you're making work that fits, they'll contact you.
If you want to be discovered, you need to be working with the people whose job it is to discover artists, which is, roughly, galleries. Leave the poor buggers at the museum alone. They have plenty of crap to carry out to the dumpster already.