New Zealand Law
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You should lodge the bond now, so you comply. It is unlikely you will be fined if this is done. As for selling the property you can do this with the tenancy or without. If you sell with the tenants in place then they just stay on and on the sale you will get a credit of the bond. If you want to sell with vacant possession then you will need to give the tenants notice in the usual way.
You would need to give the standard 42 days notice if you sell the property so you will need to start that process.
They are bound by the agreement if you gave them a signed copy and even though they haven't signed, if they don't object, that agreement will be the one in force