In Ontario, Canada, every museum has a separate mandate that restricts their collection interests. It may not allow acceptance of a stamp collection, or if it is allowed, the museum may not want it.
I offered my extensive mint Canadian collection it to two local museums.
The first museum wanted it due primarily to all of the written research contained on the various postal issues within, more so than the actual stamps. The conservator knew what a normal stamp album looked like, but was surprised that philatelists also did extensive research making a collection an educational tool as well. However, this museum's mandate couldn't acceptance from me unless I was a notable personage in the community, such as a mayor. As a fairly new resident, retired, and not involved deeply in the community, I did not qualify, so the museum could not accept it.
The second museum's mandate would allow acceptance, but declined as it could not provide security to continuously watch over a visitor while she/he perused the 70+ albums. Theft from the collection by visitors asking to see it and the cost of security to prevent theft were the only concerns. I was aware that some library's do lose pages from old volumes as criminal visitors need old paper stock to fake historical documents or steal maps from atlas, etc., for sale to collectors.
Luckily for me, the Vincent Graves Greene Philatelic Research Foundation (VGG) in Toronto needed a source of modern Canadian stamps for comparison with items submitted for certification. Since 1957, I've purchased every issue directly from
Canada Post. The VGG has agreed to accept my entire collection in exchange for a charitable donation receipt for the full catalogued value, which I update in my own spreadsheets annually with the latest Unitrade catalogue.