Combination Locked Ender Chest

The concept is to have the ability for someone to place items into a ender chest thousands of blocks away from another player, and have the other player be able to gain access to it. I like and would not change the function of the ender chest, I appreciate having the ability to store items so that others cannot gain access to it unless I pull it out of the chest. The idea came about because I play on a realm in which players are given random coordinates to build their base on (some are in the middle of an ocean, ice biomes...) at times one player will have a need for a resource another player has. One will need to travel thousands of blocks to drop off or pick up, and then thousands of blocks back... and if it is a large quantity of resources they may need to make several trips... a lock box ender chest would allow for a code to be established by one player who can place the needed items into the ender chest, and the other player could enter the code where they are at and gain access to the items they need...