This is actually quite simple. It is a little oversight from the devs. It is what many of us would like to call a glitch.

Step 1: Open Desque / desk.

Step 2: Pick up the stamp.

Step 3: This step requires you to have already called the takeout ninja and for him to have kicked the takeout. To do this, try to grab the takeout. Then spin on the chair. Next look at the cards on the ground. After that go to the phone and call the number seen on the card. Now pick up the takeout. You can now see sauce that was left behind.

Step 4: Use the stamp you collected and hit use with the sauce on top of the safe.

Step 5: now that you have the stamp with goo, close Desque / desk.

Step 6: Reopen Desque / desk.

Step 7: Use the mouse and hover over the open draw, you should see that there is no stamp, but if you hover over it, the text for the stamp will still be there. This allows us to interact like the stamp was never removed from the draw.

Step 8: click on the stamp and hit use.

Step 9: Now look in your inventory and there you have it. Two stamps! One with goo and one without! Now you can successfully brag to your friends and tell them you know something they don't know!

Step 10: (Not required) Please like the guide! share it and reward it if you thought it was helpful or funny!

Have a terrific day!