Ongaurd gives you like 17 extra keys and a big tag with the key number on it.

Best to have a big old Jantor's keyring someplace in your house/apartment (I hang mine up in the closet where it won't be easily seen) and put every key you own on it. Keep them all in one place. Never throw away a key because the minute you do you'll realize what it was for unless you know for SURE what it goes for and that you don't need it any more.

My Janitor's ring has over 200 keys on it (it's actually a series of these rings and mini climbing D-clips hooked all together. I also have "spare sets" of all my keyrings that I have just in case I can't find my keys in the morning and have to run out of the house to work or an appointment and can't wait around looking for my keys that are somewhere in the house.

There isn't such thing as "luck" -there are people who have prepared for eventualities and those who just get tossed around by the fickle finger of fate.

It's never too late to start preparing. Put those spare keys to your new lock (along with the number that comes with it) in a special spot and learn from your mistake.