No they can’t..like everything else here wives tales ... the day you can give 500 peso for 5000 Bill are over at DGM..That's true, but I've read some claims here that the supervisors have figured out how to manipulate the computer and that some overstayers were let through without the passport being unlocked. The money was just pocketed. No idea if that's true or possible(?).
I think DGM has sent out a pretty clear signal that paying in advance online is the way they want to go.
right now any type of corruption in government going to get you in dodo...