Looks like you can get a copy of your lot map. I had the same issue (identifying boundary to know whose lot the dead trees were on. I was able to find the iron markers, they stick up off the ground. Probably not able to find them in the snow, but should be able to find the with the map once the snow melts.
Contact a local land surveyor who is familiar with your area. There should be a small, square iron pin driven into the ground at each corner. If you have a metal detector…you might get lucky. 😉
Call a couple of realtors to get some names. On one corner, our lot line is 6′ to the left of the water meter because of massive rock. We found out when the lot was originally surveyed 20+ years ago.