Come to Il.. We seem to have more than our share of them. We have one up the road who wrote his own brother a citation for shooting 3 minutes early while duck hunting 5 years ago.
Himself, brother and their father where in a blind together for a family hunting day and his brother fired what was later determined 3 minutes too early and was not even warned by his brother until they got back to the truck and the CPO wrote his brother a ticket, nothing said in the blind!!!!!!!!
Sounds like there might be a lot more to that story; I don't know a warden on the planet who would be willing to appear in court over a 3-minute time difference. The likliehood of the judge throwing the case out is high. It would be even higher if the violator was the warden's own brother, the warden was hunting with the guy, and he never said anything about it being a violation at the time.
As for the stamp being unsigned - the reason this is considered an offense is due to the past history of people essentially "party hunting" with one stamp, i.e. using someone else's stamp when they weren't hunting that day. As time went on and the stamp price never went up (and basically became easier to afford), that became less of an issue.
However, a newer trend has been for someone whose hunting privileges are revoked to use a license/stamp combo purchased by someone else. So the person writing you for that would not necessarily be as much of a ******* as they would someone who has run into this sort of thing before.