A huge cache of Canadian history, stored for 200 years in three wooden chests held at a British estate, is set to be auctioned next month in London — a possible test of whether the controversy-plagued, funding-challenged Library and Archives Canada is still in the business of acquiring newly available treasures of documentary heritage. An extensive and important collection of letters, maps and other original artifacts left to posterity by Sir John Coape Sherbrooke — the Nova Scotia governor who conquered Maine during the War of 1812 and later served as Canada’s governor general — is to be sold on June 19 as the showcase lot in a major Bonhams auction of rare books and manuscripts.

A large, coloured and “exceptionally fine” map of the village of York and the Lake Ontario shoreline that was created for Sherbrooke in 1817 — showing the future Toronto in such minute detail that individual homes are depicted — is a highlight of the sale, appearing on the cover of the auction catalogue.

The estimated value of Sherbrooke’s papers is between $160,000 and $230,000 — coincidentally close to the $170,000 spent by LAC’s recently resigned national archivist, Daniel Caron, in travel and other expenses over the past two years....