I disagree. Jogil's earlier post refers to wandering perfs, but Don's image overlay shows none. A problem with the forgery theory is that quadruple blind box perfs of this type usually are produced using a single punch operation similar to die cutting or guillotining. They cannot be duplicated with the accuracy shown in Don's image using a wheel of pins, a comb or line perforator. Thus, the forgery theory asks us to believe that the forger created a die consisting of a box of perforating pins that exactly matches the original. I find this hard to believe.
Unfortunately, there are other aspects of the "error sheet" that are unexplained and that do point to forgery. The background graphics do not match any of the positions of the uncut press sheets that
Canada Post sold. It contains Chinese characters at upper right in white that do not appear in any of the press sheet positions or in the original sheets. At least one sheet with gold Chinese character printing omitted, thus showing white characters, is apparently known but the result is white print in several positions, not just one. Thus, it's possible that a forger made a high-resolution digital scan of the original with some changes, then perfed it, but I still can't explain the perfection of the blind perforations.