The presence of a band does not tell you whether or not a bird is wild.
I would report it, and let the local authorities try to determine who might have banded it.
Authorities in Greenland and Scotland (the normal breeding and wintering grounds, respectively, for the nearest population to Canada) do (or did) band wild Barnacle geese, and some of these have been found in Canada (and the US too).
https://sora.unm.edu/sites/default/files/122-136 OB V35 #3 Dec 2017.pdf
I do not know, however, whether they use the same style of bands as shown in your photo.