This is an excellent find for your area - or anywhere in North America. A quick look at ebird and I find records of one bird seen various places around Shubencadie in 2017, but nothing before or since. This is worth reporting to your local rare bird hotline or listserve.
That's not the sort they use - it would be a taller, lettered colour ring on one leg, and a smaller metal ring on the other leg. Pretty sure this will be a breeder's ring. Still worth reporting though, so that others are aware that it is around.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.