#2 Bruno Sammartino's car gets broken into

When one talks about the greatest WWE Champions of all time, Bruno Sammartino's name is bound to come up. The WWE Hall of Famer held the title for more than 11 years over two title reigns. On September 27, 1965, Sammartino bested Tarzan Tyler at Madison Square Garden.
Later that night, Sammartino went to have dinner in Manhattan, as he had done several times in the past. Bruno left the title belt in his car, and was dumbfounded when he returned after having his dinner. Someone had broken into the vehicle and stolen the belt. Much like Lawler, Bruno never recovered his title.
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#1 The Rock's Brahma Bull belt goes missing

Today, whenever a Superstar bags the gold, they get custom plates for their newly won title belts. This practice of giving custom title belts to Superstars has been going on for a long time.
Back in the mid-2000s, John Cena shocked the world by debuting the spinning WWE title. If we go back even further into the past, Stone Cold Steve Austin possessed a Smoking Skull title belt.
The Rock was also going to have a customized title belt, featuring a raging bull on it. The belt reportedly got lost in the mail. WWE decided to drop the idea and the belt never made it to TV. Joe Marshall, the maker of the belt, stated that the title belt was stolen in the mail by FedEx, but was eventually delivered. Fightful was told that Marshall's assistant at the time, Brian Kennedy, could confirm the story.
Thanks to Pro Wrestling Stories for the information.