Whut but how!?

I found this rather interesting.. somebody found a way of preserving items after their expiration date (as you can see this nose is from 2 years back and shouldve expired long ago).
Does anybody know how to do this? and are there more items around like this? I could think of tons of expireable items that would be way game unbalancing if they would be around forever

edit: might aswell have posted this in the new "call for action" forum.. oh well i guess it doesnt matter that much