Investigating Post Rehab Work

[Robert Alexis]

Last year a foreclosed property I was looking to house hack caught my attention.  I ultimately pulled out due to the underestimated cost and scope of the rehab. The house was eventually purchased and renovated and is now up for sale again and I’m highly considering purchasing, however, I’d want a thorough understanding of the rehab that was done given the amount of problems I know existed at that property (plumbing, mold, etc). 

How best can I source that information if I were to make an offer? Can I ask for proof of the work? Would this have to be called out in the contract? 

All insight is appreciated.