I remember last time before auction, auctioneer must publish POS in newspapers and distribute copies to neighborhood.
10+ years ago they begin published in their official websites, post up complete POS. Slowly website info became formal and legit, no more advertise in newspapers.

Nowadays very hard to see legit POS in newspapers and websites. For website they put half details, you need to request and give them your particulars like name, ic, phone, email etc still can't get full details ( usually the house number) then they will ask you sign up premium membership only can see real POS. Banks do the same. Sometimes need to deal with third party like agent for POS.

Is it legal by law for auctioneer not to publish full POS openly?