Alright so this is a cool glitch I found playing a couple days ago, and I couldn't find it on here so I decided to share. What it does is give you 2 different mystery boxes on the map.

1: Get Fire Sale
2: When it starts blinking, buy the box.
If you did it correctly, you should see the box disappear as well as your gun. For some reason, the box will think that the gun is the Teddy Bear and it will fly into the havens (Unfortunately I had to see a raygun fly up ) Then when the fire sale ends, 2 boxes will appear because it treats the box that disappeared as a real box. Now you have 2 boxes! If you get fire sale again, you must repeat the process or else you'll go back to one.

I'm sorry if the post looks bad, it's my first.
I'm sorry I don't have video proof, I don't have a capture card, but wouldn't mind if someone can say it's true so people don't think I'm lying lol.
Thank you for reading! And don't forget to rep and do whatever people say at the end of posts!