A box like that is worth far more as a collector item than it would be for shooting ammunition. Not sure of exact value, however ....
Not sure what sources there may be for ready-cast bullets for the Snider in Canada. You may have to find someone who already shoots the Snider and see if you can get some bullets from them. The general consensus is that bullets in the .585" or .590" range work best, with no need for a hollow base. Hollow-base Minie bullets as used in muzzle loading rifle muskets "will go bang" but with poor accuracy, likely, because they will be significantly under bore diameter (i.e. likely .575" or less) and the skirt can't flare properly when confined in a case mouth. Many people report excellent results using round ball of .600 size or thereabouts, especially in the slow twist 3-band rifles.