On average, I've been finding a bit less than one "W" per box. I've got 6 AMP, 5 San Antonio Missions, one WiP and one RoNR... Frustratingly, I have not found a single Lowell. I've probably seen well over 500 of the buggers with P/D mintmarks, though.
Fingers crossed for quarter boxes to start coming in uncirculated, but I dunno. I still haven't seen any 2020 bat quarters yet. I wonder if I need to try a new bank. I've gotten a box of uncirculated 2019 pennies from my bank before, but no other denomination. With 90% of retail shops closed right now, the mint must be sitting on some seriously big piles of pennies/nickels/dimes/quarters that aren't needed.