Take 2 business cards

Measure them so that it makes a 3-D rectangle, cut the small square out
do that twice

Tape on one side of the card

Take the square you cut out earlier and tape them together

I put a couple layers on

Do the same with the next side

After you have done the next side it should look like this so far

<-------

Tape the remaining side

Cut out piece of an index card that fits at the bottom of the rectangle

Tape the index card to the bottom of it and flip it over

Now you have a little box for anything

If you want it tape it again on the outside using clear tape so it holds up better :) hope you liked :)