The staff there can advise on getting collecting and import permits. Financial support is appreciated. This is just the cost of keeping the roof on the building, heating, air conditioning, sweeping the floor, etc. That is why museums think twice about accepting donations, and why they often ask for financial support for curation. Preserving scientifically important collections is our mission, but with limited funds and space, we have to be careful what we preserve.
Different institutions have different priorities.
Some museums do not have space or funds to add material even if it is of scientific value. Others specialize in the fauna of a particular geographic area. The least scientifically valuable collection to us is a synoptic worldwide collection of purchased shells, since it will largely duplicate material that we have, generally has only one or two specimens per lot, and often has imprecise locality data. One man who donated his collection a number of years ago treated shells essentially like postage stamps. If he saw on a list a name that he didn't have in his collection, he bought it.