If each box has a unique code, they will need at least an 11 digit code with letters and numbers in it, given the amount of ammo sold commercially in the USA. Imagine how many 50 rd boxes of .22 get sold every year.
Assuming that the sales keep up with historical levels, of course.
Along with the code comes ammo registration, so if the police find a slug at a crime scene that has part of your code on it, you will be hauled in for questioning while your home is searched for all ammo, and your guns temporarily borrowed for ballistics testing, fingerprinting, serial number check for registration, and DNA profiling.
I’d expect a civil suit from an aggrieved family (helped by a nonprofit grief counseling organization) since you are responsible (it is your bullet after all).
What if I swap you half a box of mine for a half box of yours and we mix them ????? Anyone else in on this deal ????????????