Re: Will Revenue check Stamp Duty?
Well - let's see:
If you declare yourself to be a first time buyer when you're not, in order to avoid tax liabilities, that's fraud and tax evasion. Quite aside from the AAM owner and moderators' stance, which is that AAM does not condone tax evasion and won't allow discussion of how to engage in such illegal practices, there are lots of crabby posters like my good self

who would respectfully suggest that you pay your taxes like the rest of us, please.
Revenue is increasingly reviewing property purchases, and is making very public noises which must be seen to be a preliminary to a major crackdown on various forms of evasion (the most obvious being in relation to rental properties, non-declaration of rental income, and stamp duty clawback where a house is rented out within five years of FTB purchase). Since, frankly, any idiot can see this coming, you'd be advised to keep your tax affairs in order and tell any auctioneer or financial advisor who suggests otherwise that you'l report them to the relevant regulatory or professional bodies of which they may be members.
Remember, if you follow their "advice", and are subsequently assessed by Revenue and have to pay the tax, arrears, and interest, it'll be coming out of your bank account, not theirs.
I would suggest that if you wish to minimise your tax liability, buy a new house if you can as it may be stamp duty exempt, and contact Revenue directly to consult them about your entitlement to TRS - there may be a greater level of flexibility there depending on your circumstances.