In the interest of due diligence:
1. Are there any outstanding debts or unpaid invoices not yet due?
2. Are there any current legal issues ongoing with the site such as copyright claims, disgruntled worker lawsuits, etc.?
3. What does your systems documentation consist of? I mean, are there diagrams (entity-relationship, data flow, etc), flowcharts (micro-level, macro-level, etc), code comments or is it just "self-documenting code"?
Also, just as an aside, would you be willing to help in communicating with the existing team and the site's community for a smooth and peaceful transition of the site's operations from the existing team to a brand new team? I know, there are no guarantees that it would be smooth or peaceful, but would you be willing to talk with the existing staff and community to help make the transition smooth and peaceful as possible?