The disclosure is an issue, the 1031 is not (the first one is supposed to give you information about the property before you close, the second one simply allows the seller to get a tax benefit on their side of the transaction, it does not affect you).
The seller's disclosure should have been provided to you prior to purchase.
It also should have included actual disclosures.
Your real estate agent can be reported to the state Dept. of Real Estate for failing to perform their due diligence on your behalf.
As this is after closing you are in an interesting (not curious, but difficult legally) position - you cannot really back out of the transaction because they didn't defraud you (they didn't make any disclosures), but you also can try to demand that they make actual disclosures on the form prior to signing the document.
I don't know what kind of purchase price you are looking at here, but you may want to consider speaking to a lawyer (promptly, and before you sign any of these documents - again the 1031 really isn't an issue, but the disclosure is).