To Sadozai,

In answer to your question, whether the court attestation has any legal significance, I don't know. It may have some.

The reason I say this is that I am in very much the same position as you. I purchased three apartments. I have received Nakheel contracts (the USPA, that is) for two of them, but have received nothing for the third. All I have is a series of payment receipts, booking forms, etc. from the agency/realtor, but these are worthless. I know this because I have been double-booked four times now for, and of all of these receipts counted for nothing with regards to ownership of the previous four apartments.

In your case, with regard to the apartment they have given you the key for, I think you have some grounds to be optimistic. The very fact that Nakheel have previously registered your brother's name (even if they did it incorrectly) does mean at least your apartment hasn't been sold to somebody else.

The legal attestation in the court may or may not be strong enough to guarantee you eventual ownership of the three apartments. But if your agent has sworn in front of the court, I definitely think it would make harder for them to run off with your money and deny giving it you back.

If your agent is well known and well established, I think you will at least get your money back.