Lexmark used to have so-called Pre-Fill cartridges for laser printers. (I'm not sure if they still do).
They would sell you a cartridge at a much lower cost if you sent them back your old one, but the catch was the serial EEPROM on the cartridge would tell the printer to stop printing after a predetermined number of prints no matter how much toner was left.
I used to just pop-off the board and replace it from another cartridge that was empty but wasn't a pre-full. Or remove the toner "tank" and mate it to another cartridge. Lexmark (and Dell) used the same cartridge designs for their laser printers but had a different part that fit a keyed slot so you couldn't fit it in. But the keyed part was easy to remove and I used to use really old 12PPM toner on 24PPM prints with no issues.