Seller delay in providing signed estoppels

[Grace D.]

Hi BP'ers! I'm currently in escrow for my first property. Almost everything is set except the seller hasn't been able to provide signed estoppel letters. "They are working on it" was their response. We are way past the contingency periods but I haven't signed off on the contingencies yet because of the lack of the signed estoppels. I have the rental agreements to verify the rents but for some reason, the seller does not want to provide the tenants' security deposits (set to $0 in the unsigned estoppel letter). There's still about 2 weeks to close but I'm not sure how to proceed. Any thoughts/advice would be much appreciated.