The other problem I find with Aussie silver, mostly shilling and florin is you can have full lustre on VF pieces! and here in NZ I find cleaning is a common issue, many naive collectors get fooled by cleaned VG and Fine coins.
Full lustre is often artificial thou.,Dealers know what they can and can't get thru. PCGS/NGC.
A Oz Shilling or Florin that has spent a 100 years in a draw is almost always toned,nothing like what gets slabbed as genuine lustre these days.
Just my opinion.