Green’s Dictionary of Slang

white mice n.

[rhy. sl.]

1. (Aus.) lice.

[UK] in Partridge DSUE (1984) 1332/2: white mice Lice: low Aus.
[UK]Dodson & Saczek Dict. of Cockney Rhy. Sl.

2. dice.

[UK] in Picture Post 2 Jan. in DSUE (1984).