ossak_hennesy

[ossak_hennesy]

put a philosiphers stone in an ender chest so my friend can take it out and put away and it disappeared

 

[D34DPlayer]

I guess it was one the EnderStorage ender chests since you are the only one who can access the vanilla ones. Basically those ender chests work by default in "public" mode, any chest with the right color code will be able to take that item, and "private" mode (set by right-clicking a diamond on the chest), where only the chests you place are linked. What probably happened was that you were on public more and some one else had a chest with the same color code (probably with a conduit extracting from it).