Why would he have “ checked “ a gun at the Sheriff’s office?
The odds that Earp ever owned that gun are virtually nil.
If you assume that every story you ever heard about a gun or knife having belonged to some famous or notorious historical character is false, you will be right a least 90% of the time.
Even with the better museums, the fakery probably runs close to 40 to 50 percent.
Sometimes museums actually have the real thing on display initially, but. months or years down the road a museum employee will be secretly offered big bucks by someone who has aged and serial re-serial-numbered another gun that looks identical to the display piece.
Employee that is in need of cash takes the money, swaps out the guns.
Fake gun goes on display; museum employee gets a cash windfall, real-deal gun disappears (with copies of any provenance documents ) into wealthy domestic or foreign buyer’s VERY private collection.
Everybody’s happy.