wrote a blog about one property that deals with a lot of these questions...https://www.biggerpockets.com/blogs/9786/62083-gardner-way-the-brrrr-that-left-me-feeling-cold

It's not keeping things cold.

In that case they just got cold feet and wanted out for no reason and all deadlines had passed.

I am all down to work hard, network, knock on doors, cold call, etc.

In cold belt states like OH you have more isolated pockets of growth and then lots of dead areas or declining areas where people are migrating away.The baby boomers and retirees are leaving cold belt states in droves.

If this was known in advance and is sort of "Now a problem" then you are getting cold feet.

Here are the factors that we look at that contribute to the life of galvanized pipe: Internal corrosion or mineral build up is dependent primarily on the following factors assuming we are talking about cold water.Ph of water, Alkalinity of water / hardness of the waterCorrosion will also be increase in there is high levels of sulfur, dissolved oxygen,...Iron bacteria can lead to corrosion and build up at the same time.All Cities and many parks with or without their own wells are required to test for Lead and Copper this is really just a measure of the corrosive nature of the water being put through the system.

Does not want the property sitting cold if you don't close.

Since you are in NJ I will assume it is cold and wet in the winter.

Type of house if you are just cold knocking would be one that looks to not be taken very good care of.