Welcome to the forum, 3 lb crappie are rare in these parts , about never seen one locally, they possibly exist , but according to the fisheries that work this area , there just not here in that size range.
Rafe Brock and I chatted a good while on this subject and he has never personally seen a 3 lb crappie in the ft Worth area after many years of trapping and population studies.
I think there might be one , but still haven’t seen one over around 2.85 myself in my local travels.
Hope you find one , might have to travel, some places have them with a bit of regularity. Mississippi for sure is on that map.