There are thousands of uses for Altiods aside from eating them. However if they can open unintentionally it can make them far less effective. Outlined in this intractable is how to build a free easy lock for an Altoids case.
Step 1: Gather Materials
For this project you will need a set of needle nosed pilars, wirecutters, a paper clip, a thumbtack, and an Altoids container.
Step 2: Straighten and Cut Paperclip
Using the needle nose pilars striagten the paper clip. (It doesn't have to be perfect) then cut a small piece of the paperclip with wirecutters.(see image two for approx. size)
Step 3: Punch a Hole
Use the Thumb Tack to punch a hole through both parts of the Altoids tin. This is easier said then done you may have to do one section.
Step 4: Bend the Paper Clip
For the first bend make a 90 degree bend about twice the size of the hole down the piece of paper clip. For the second bend stick the 1st bend into the hle and mark where the clip reaches the top. Then bend again at 90 degrees to create a 'c' shape.
Step 5: Volia!
You Should have something that looks like this. To lock the case slide the smallest end in the hole, lift the long end up and then slide down.