For anyone that wants to keep an eye on the weather just use this site,there is another storm front coming through now not as bad as the last one but you just never know this time of year..imho..
http://www.bom.gov.au/products/IDR664.loop.shtml#skip
If the sliding doors were locked then you may have a case,the force and power of last weeks storm would push water in everywhere,just stand your ground with the real estate agent,rather then just bend over and let nature take it's course,...imho..