A time capsuled that has been buried at Maple Leaf Gardens since 1931 was opened on Thursday. Contents of the capsule include: - A four-page typewritten letter from the directors of Maple Leaf Gardens. Four-page stock prospectus for Maple Leaf Gardens Ltd. - 1930-31 NHL rule book. - 1931 rule book for the Canadian Amateur Hockey Association. - 1930 Ontario Hockey Association rule book. - 1931 Toronto Municipal Handbook. - A red ensign flag. - A small ivory elephant with fragments of a blue ribbon. The Maple Leaf Gardens stock prospectus revealed Thursday reports that hockey gate revenues for the 1929-30 season were just over $186,000 and expected to be "close to $200,000" for the following year. The Leafs now collect an estimated $2 million in gate revenue per game.