Can anyone help me solve this mystery?

Okay, this might sound absurd, however, while cleaning out my desk today at home I came across 3 adhesive bar code labels with a series of letters and numbers. Obviously several have been removed from the sheet, but, I am clueless as to WTF they are, and WHY I have saved them? haha
I have no recollection of what significance they might have.
Any ideas of what they could be?