Excerpt from the article…

Of 426 Ontario Indian residential school students known to have died from 1867 to 2000, 38 percent have been forgotten by history.

New data contained in the just-released final report of Canada’s Truth and Reconciliation Commission show that neither government nor school officials bothered to record the names of 162 of the deceased Ontario students.
…
Across Canada, the commission identified 3,200 residential school deaths, in 32 percent of which no names were recorded,

And Justice Murray Sinclair, the commission’s chair, suspects the number of deaths is actually much higher, because of poor record-keeping and destroyed or withheld documents,