The quick answer is.....NO. Take for instance a paperclip. It is a spring of sorts. When it is resting whether it actually holding anything or not, it is static and stored energy is stored. Lets say for arguements sake that you straighten it out. Then apply some work into the equation. Start bending it back and forth at it's middle. Eventually it wil fail and break into to pieces.
Like the springs in a MAGAZINE, when the metal is static it will retain it's properties regardless if that magazine is loaded or not. Springs wear out from being worked. It's a basic principle of metalurgy. Loading and unloading a magazine is what wears out the springs, not sitting around regardless of being loaded or not.
BTW, clips like moonclips are used in revolvers. Semi automatic pistols use magazines.