Susan, If you gave your earnest money deposit for the escrow, this is a bit out of step with normal proceedure for purchasing a coop.
Prior to a contract of sale being signed and your deposit given, your Attorney should have had the offering plan and at least two years of the building's financials which is customary. This allows the Attorney to do their due diligence which would then result in an OK from your Attorney to sign the contract. Seems like someone dropped the ball.
If you're not working with a broker then it is up to your Attorney to obtain the necessary documents. You are entitled to them. Start with the current coop owner. Financials are sent yearly to each shareholder.