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As you get more experience, start studying material costs at your local home improvement stores (whether mom-and pop or "big box"  stores),and work with more contractors, you can change out J's numbers with your own.

Has box vents on other side of roof for venting. 2nd company caulked shingles that where loose.

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They had box gutters, but the gutters were made of seamed copper.

I also use photo enhancement services such as Box Brownie to improve a photo for a few dollars to get that twilight setting.  

I got the $500,000 coverage for landlord liability; however, in the box next to it, a “NO” was checked for “with personal injury?”

Box) that I’ve always used for mail...never have I used my home for that...Just makes me feel vulnerable.

There is usually also a paper sheet inside the trailer somewhere - often it's pasted inside one of the kitchen cabinet doors, but it can also be pasted to the wall near the breaker box. 

I personally don’t even go in the house but I send one of my guys in to check everything out then I offer pennies on the dollar, sign a purchase agreement, give them a box of contractor bags and the smoke cans for fleas along with sticking a lockbox on the door.