This also happens to me
You can instant win game with some hack [i know how] or find a script for the drop probability
There is one glitch and with it you can get 2 safes and 2 drills , HOW?!!
1.Download the hack for PD2
2.Unlock all achivements with it.
3.You will get 2 safes and drills , but you can't open them because you hacked it.
4.Delete the hack from your PD2 files
5.Open the safes and enjoy