I’m from Atlantic Canada, and I haven’t yet seen any INV prefix notes. INT is starting to become quite common, but INU and up I have not spotted. I will be posting them to the SNDB when I find them.
I also noticed you reported a $100 HJB prefix to the SNDB (current low at this point) - early in February. Is HJB starting to become common in your location now? If so, I bet HJD will be next, if it hasn't yet. I find it is typical for Atlantic Canada to see three new prefixes max per year for each high-demand denomination (all except the tens). March/April, August, and December are typical periods when new banknotes appear in Atlantic Canada, it seems. It's possible that HJB started appearing in Atlantic Canada prior to Christmas, and maybe you'll start seeing HJD now or maybe August, and another in December (either the Rogers-Macklem signatures, or maybe the currently elusive HJG).
Also, what is the latest $20 prefix found in your location lately?