Originally Posted by
Whizkid
Why so, You have every right to leave the Terminal till you board the aircraft (You can do that after that also, but relatively complex).
What if your plans change / Connecting flight cancelled / Etc.
I did it many a times - The CSIF will ask you why - Give a reason.
Note: I do not support faking the printout, but want to point out that you can leave the terminal.
The procedure is that an airline employee must accompany you to the entrance and sign you out. Which airline employee will agree to do that if you forged a document to get in?