A Fossil Storage crate allows players to store fossils discovered on Fossil Island, then retrieve them from any of the other Fossil Storage crate. There are five crates total, four of which are on Fossil Island: one in the Museum Camp near the cleaning table, one next to the mycelium pool, one just inside the entrance to each Wyvern Cave and one underwater next to Mairin. The fifth is next to the stairs in the basement section of the Varrock Museum where the natural history quiz takes place.
A fossil storage crate located at the Museum Camp.
To use the fossil storage, players may click the box to open up the Fossil Storage window, which is an interface that shows the various types of fossils that can be found. They can then deposit or withdraw fossils by clicking on them, and can choose to deposit or withdraw more than one as if they were accessing a two-way bank deposit box whereas a bank deposit box only allows players to deposit items. Accessing fossil storage requires a PIN, however.
The interface when accessing Fossil Storage
Clean or uncleaned fossils can be added to any of the storage crates around Fossil Island as the contents of the storage crates are synchronised; this means fossils can be cleaned in the Museum Camp, stored in the storage crate and then collected from the storage crate in the basement of the Varrock Museum when they are ready to be added to exhibits, thus avoiding having to take multiple inventories back and forth between the camp and museum.
Only 510 of each type of fossil stack can be stored in the crate.