What are thing to take into consideration when the handover starts, to make sure we have everything and be capable to maintain that product in the future?
The only thing you can make sure is :
- the code builds and execute successfully
- the unit tests build and all pass
- any other tests (acceptance, integration, etc)
- database of open issues (easy to get if they use bugzilla)
Everything else is up to the current maintainer to hand over.