关于房子的fireplace insert, 边界,房子的扩建permit的几个问

看了个房子想买来自住,有以下几个问题请教下
1:"Is fireplace insert certified by the us environmental protection agency 
as
clean burning appliances to improve air quality and public health?" 回答“
dont know”这个问题大么?怎么解决?

2:"are there any encroachment, boundary agreements, or boundary disputes?"回
答don't know
"is there a boundary survey for the property"回答don't know
这个房子周围有fence,但是以上回答是否意味着房子boundary有问题?如何处理呢?


3:房子扩建了两间屋子,据listing agent说有permit,但是在政府网站上的permit 
history一栏看不到permit记录。这个问题大么?怎么处理?

多谢

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