A little L041C108 party reporting in...
All done on water with a M4E
#1333 booted 100.9 5449mhz 1.55v 2c2t absolute max
#3576 54x took more than 1.55v to boot 2c2t. Booted with 1.62v
#3984 54x 1.55v boot
#4584 52x boot 1.55v
So out of 4 chips... 1 is 52xx and three are all 54xx with one that doesn't run with lower voltages.