Dun need to hide.the seller agent already told the seller his area or his block and nearby block similar to his flat's valuation +-20,000/. Wun fluctuate too much. Hdb officer not stupid. Unless is bank.
U think the seller dunno the valuation meh unless seller agent screwed up.
Otp issued buyer and seller still can back out. Only OTP all signed and remaining deposit + 1k given mean u are in the game. Seller and buyer if backout have to pay. Otp is a phrase buyer check with bank if loan approved a not and to ensure adequate money for downpayment. If not approve, seller will return the deposit. Hdb is 1k. Pte is 5k option fee. Seller very difficult to back out unless he seek approval from buyer. Cos when otp signed mean seller agreed to sell at this price to the buyer. The 14 days is for buyer to exercise whether to proceed the transaction. When 14 days the buyer paid the remaining deposit mean agent or himself will have to apply through hdb, for pte lawyer will initiate the buying with URA for approval of transferring ownership with the the seller. Prepare documents, coordinate with bank to get the cheque, asking u to pay buyer stamp duty and additional stamp duty if any. Last your cheque for downpayment and bank cheque to the seller. Upon completion, URA need 2 to 3 weeks to issue u a deed to confirm u r the owner of the property(bank name). For hdb, go down to toa payoh, hdb officer will settle go through the details and ask u to prepare cashier order or cheque.signed documents with bank or hdb to deduct from cpf. Pay 200plus for hdb lawyer fee. Upon completion, can ask agent help u go down see if the house is ok and hand over the key to agent and agent pasd to u.ownership can be viewed directly from hdb website