I'm sugarcoated's pal who's been hunting the stupid Windsor tag, and I agree. I've found just as little today as I did last Tuesday.
I looked in cracks, on trees, dug around loose planter's soil, checked around benches, under overhangs, in vines, all around a building, all over the statues and memorials, and nothing.
I'm convinced that no one from Epic even checked to see if that tag was even there today, and it was on that fishing line last week. At least that was near the coordinates given.
If that tag is ever going to surface they'll need to put out a hint or something, because as it stands, there's too much park and not enough hiding places by where it is supposed to be at.