I toyed with using this for the post title:
I sent these to a customer there yesterday:

But you’ll have to be on the lookout for them by serial number, not by color (as distinctive as that is). I “adjusted” the color in the image, not on the actual bills.
Oh, and if you want to track/report sightings of these bills, you might be able to do so here and here.
Do you use Where’s George? I think I’ve listed 58 bills there over the years. But it’d been a long time since I’d added any.