I have many cake decorator tips and sometimes even 2 or 3 of the SAME tip because I use them that often! It is VERY HARD TO SEE the numbers imprinted on each tip so,when I get a new tip I label it with my labelmaker from Brother. It saves time when trying to locate a tip and it can make it through the dishwasher in a special bag for tips [although I hand wash them ,too! I use the dishwasher to sterilize it even more!]. If the label does fade, I use a permanent marker to relabel it.
Additional tips of the same number I label as back-up tip #2, 3 or whatever number it is.