I learned just now that a new prefix, FLZ, was reported to the SNDB recently. That seems to be an unusually big jump in prefixes since FLA was the only FL* prefix reported thus far, and according to some other user he said that the initial batch of Lane-Macklem $20s only go as far as FLH.
Unless FLZ is a Rogers-Macklem $20, I am taking this FLZ find with a grain of salt.