A simple Yale lock should have first been attacked by picking - either manually or by a lockaid style pick gun.
I went out and purchased a key save for 30 dollars attached it to the outside of my apartment door and set the combination.
No these lock boxes have the attachment screws in the box and are very difficult to remove
It goes back to the old saying that locks are for keeping honest people honest, nothing more.
You fellas need to find a change purse
.I sometimes carry a grocery plastic bag. On rare occasion.