As it had still been possible for either Manchester City or Manchester United to win the League on the final day of the 1967-68 season, the Championship trophy was left at the home of the reigning champions United.
City won the League at Newcastle while United lost 2-1 to struggling Sunderland.
You can read about that final day of the season here:
https://gjfootballarchive.com/2021/05/11/manchester-city-win-the-league/
At United the Championship trophy vanished at some point during that day. The Daily Express reporter Alan Thompson set off on a mission to track it down. He started questioning the Old Trafford staff: “Secretary Les Olive was under the impression that a League official had taken it earlier in the week, Matt Busby was not at all sure what had happened to it, and for a minute or two it was lost until a member of the female staff admitted that it had been locked up ‘in the vault’. You are at liberty to allow full rein to your imaginations in concluding exactly where the ‘vault’ is at Old Trafford. But the centre of the boardroom table, where the League Championship Cup has stood proudly for the last 12 months was occupied by five shillings worth of flowers. Sit down the City fan who says symbolic.”
City still needed the trophy to be presented (Joe Mercer had offered to walk all the way from the Newcastle game to Old Trafford to collect it if he had to!) and so a friendly against Bury was hastily arranged for the Tuesday (May 14 1968) following the Newcastle game to enable the Championship trophy to be presented.
If the destination of the title was not obvious during the season, the trophy would be presented at the League’s annual dinner but as City would be on tour in America, the League agreed to present it at Maine Road. The presentation took place before the Bury game with Tony Book and the rest of the players going on a lap of honour before Mercer was handed the trophy to lift above his head. The crowd roared with delight and then witnessed a 4-2 victory.
Bury’s two goals were scored by Bobby Owen who, two months later signed for the Blues.
The game was noteworthy for it also included an appearance by Malcolm Allison. For much of the game he’d sat, wearing his familiar red tracksuit then, with about ten minutes left he substituted George Heslop and entered the field himself wearing the number 8 shirt. This caused a little confusion as Colin Bell remained on the pitch with the same number but nobody complained, after all it was a night to enjoy especially when Allison threw himself into the game. He forced a great save from Neil Ramsbottom, the Bury ‘keeper, and had a goal disallowed. The City supporters chanted ‘Allison for England’, and even called for Mercer to take to the field.