Magic(Trick of finding a person using post or any other card)

Effect: The Magician has five volunteers write their names
on five separate postcards. The magician gives the
volunteers each an envelope. All the volunteers are
instructed to put their postcards on it into their envelopes.
Then, they all mix up the envelopes, and give them to the
magician. Claiming to have no power at all, the magician
hands everyone an envelope. When the volunteers open
their new envelope, it contains their name.
Setup: You need 5 postcards, 5 pencils, and 5 envelopes.
On the envelopes, you are going to make a small mark,
with which you can identify the owner of the card. Before
you give the volunteers their card, prepare each envelope
as such. With the first envelope, you make a small mark
on the back, in the top left. That is number one. When you
give someone that envelope, in your mind, associate
them with number one. Do the same with the next
envelope, except make the small mark between the
middle of the envelope, and the left side. Remember who
is number two when you give this out. With number 3,
make the mark in the middle of the envelope. With the
4th, make the mark between the middle, and the right
side. Obviously, with the fifth, you put the mark on the far
right. All you have to make sure you do is remember who
is what number.

Performance:

1. Begin by handing out the postcards. Have the audience
members focus more on them than the envelopes.

2. Instruct everyone to write their name, and even make a
little drawing, or distinguishing mark, etc.

3. Hand out the envelopes and number the people in your
mind.

4. Have the audience seal the postcards in the envelopes
and mix them thoroughly. Once the envelopes are out,
you shouldn't touch them except for handing them back.

5. Hand the envelopes back to their owners.

Tips/Comments: The only thing difficult about this trick is
actually remembering whose envelope is whose. Once
you get that down easily, you're all set for this trick