Assignment of Contract (newb question)

[Tim B.]

Purchasing an off market property from a wholesaler. He says he has a contract with the original seller but I have not seen it. I see that the seller has it listed on the mls but hidden from public view (can only be seen by agents) at a much higher price. I received the assignment of contract to sign at the agreed upon purchase price. Should I ask to see the original contract between him and seller? Anything else I should be checking for to protect myself?