Green’s Dictionary of Slang

1. (Aus.) a purse, a wallet.

1967		‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxv 6/1: grey nurse: Purse.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 10: He had changed his mind about going home just yet. His grey nurse was still pretty healthy and the prospect of going home to an empty timothy did not now seem like a good idea.
2000		Bug (Aus.) 24 Apr. 🌐 This big black bastard just came over to me, declared his name was Rajeed and slapped a grey nurse on the table and declared: ‘Have one on me!’.
2002		Pete’s Aussie Sl. Home Page 🌐 grey nurse: a purse.

2. (Aus.) a $1000 bill.

2013

T. Peacock More You Bet 67: The ‘paper $100 note’ was known as a ‘grey nurse’, due to its colour.