The only reason I could see doing that is if there were some kind of toxic chemical in the wood but if it was just a normal flood with non-toxic water, you don't need to worry about that.  

I know you don't have the toxic chemicals etc.

Some varieties of mold are toxic and may cause adverse reactions in certain individuals.Landlord’s Disclosure (initial)(A)Presence of mold and/or moisture hazards (initial one below):______ Landlord is aware of present or past mold and/or moisture hazards in the housing unit.

I didn't buy them to let them collect dust... and Captain Planet is not going to stop me.

Might undervalue it like mobiles or manufacture homes get a lot of tmes .. which then makes it hard for buyers to get financing  .. so with that in mind as long as you go into it with the assumption that your buyer may have to have a large amount down or all cash then your ok .. because .. the plus side it it is generally much cheaper to build a container house ..up to 56-60% but i would budget about 25-30% cheaper to be on the safe side .. also they go up quicker if you're u have someone who knows what they are doing .. biggest problem is getting the R value from siding and insulation high enough and safe from any toxic fumes they may have .. i think there is non toxic spray foam but i know isulation is a concern as is mold because of the insulation issue ( vapor barrier ) at least the sites a read ..  

My brotha' rented out his house in our town of Encinitas, CA (the best beach town on the planet mind you) with 180 degree ocean views. 

-Check flood, wetland, toxic waste and endangered issues.

It didn't hold up well and it was highly toxic due to all the formaldehyde and other chemicals used in the curing process.

I am probably the most realistic, pragmatic person on the planet.

That being said, your actual down payment and fees should be around 40kSo, Monthly cash flow of $1,400 x 12 = $16,800 annually Investment of $40,000 -- Return of a whopping 42% annually.There is not many investment on the face of the planet that can beat that percent of return.