As I’ve said , I may have gotten the letter , which because of Canada post wink wink , I never saw
Spent the last little bit doing a bunch of reading online.
It seems that the days of boats "slipping through" and never getting the dreaded letter are gone (ended around 2008ish I gathered), pretty much everyone reports getting the letter anywhere from 6-12 months later to a few years in a few extreme cases. But most within 8-16 months.
As for just ignoring the letter, there's not a lot of info out there from people who chose to do so. So I suspect one of these situations resulted:
1/ The letter was ignored, but the issue didn't actually go away, it just kicked the can down the road. Maybe a few years down the road, maybe more. But it doesn't seem like it's unlikely it went away.
2/ They ignored the letter, another demand came (perhaps with a penalty this time as well as interest, and they quietly paid and didn't crow about it since it was a losing battle in the end, which of course, nobody ever talks about online.
3/ They replied to the letter, stated some rediculous low amount, paid the taxes accordingly, and it may or may not come back to haunt them if they send a letter to the seller as well verifying the amount. (I actually had this happen on a trailer I sold about 15 years ago...)
Anyhow, I know my sister won't play games when it comes to taxes, so when the letter comes, she'll pay the amount due on the full actual amount.