@OdinHighwind
Thank you for reporting.
Did you take 20,000 damage or get a game over from an explosion?
This mod doesn't make lockboxes invincible, it only neutralizes the explosion damage of trap lockboxes that would try to kill the player, so it doesn't affect the originally harmless explosions of regular lockboxes or their low durability...
I've just uploaded a mod that makes it less likely for all lockbox explosions (loss of items due to failure to open the lock) to occur, including non-trap ones, so please try it out if you're interested.

General Armored Lockbox
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3328911536

Doesn't work. Just tried a lockbox and it immediately exploded after the 2nd shot.

LOL

I set it to 0.

How to set damage to 0 ?