Institutional Memory

I don't know why but I always seem to be the one in the department relied upon most for my institutional memory. I'm not the longest serving employee but because I am the most organized, I constantly get asked "Where's this? or What did we do with that?"  I've had phone calls at home on my day off from staff members who can't find a book or a box of something because they are too lazy to look in the catalog or in the storage stacks to find it themselves.