so how did it go?

The very first auction I ever attended had a somewhat similar situation. Woman and daughter (20's) were in tears. One of the Boston regulars went over to talk to them, came back over and said to all other regulars that they should not bid on her locker so she could get it back. Everyone actually listened and she got the locker for the starting bid of $100.  Not the nicest stuff in there, mostly personal items that they were able to recover. It was nice to see that the regulars had a heart for the situation, although I have been to many other auctions since where that NEVER would have happened. 

Broken wooden spoon. But out of the corner of his eye, lodged underneath the stained and slightly smelly mattress he noticed a....

You are right on with your list.  From my limited experience, I have found that in the boxs you should be prepared to deal with lots and lots of cd's and dvd's. Many in scratched condition. Plenty of paperwork and other personal items, and many small tools (basic screwdriver/hammer stuff). 

Thanks Money.

The $50 locker was the kind of fluke.  Most lockers here are in the $300 to $500 range.  It went for so cheap because near the front door of the unit was a dingy mattress, box spring and a large, heavy looking and nearly fallen apart dresser. Those were the real eye catchers and it scared off just about everyone. They went right to the dump. What scared others off did not easily scare me, I don't mind rolling up my sleeves and getting a bit dirty, it adds to the fun.

Funny, what caught my eye about the unit was a display light sign that was turned in a way that you could only see the Microsoft Windows 7 Logo. My full time job is running an IT Consulting business, so I thought maybe there would be some technology related items that I would easily be able to make some money off of or use them in my work.  Turned out that the sign said "Games for Windows", and the unit was owned by twenty-something computer gamer, there was nothing tech related at all that had any value.

What I did find hidden under the mattresses though was a set of Bowflex 995 Dumbells with the stand.  That one find made the locker, I sold them easily on CraigsList for $250 (asked $300 and waited patiently while the $150 and $175 offers came in). Also sold a maple bed frame on CL for $50 and some other misc. items on ebay. It worked out, although the item that caught my eye is tough to sell, no takers just yet. Its a cool sign though, I might just keep it and hang it up in my office.

The wife is fine, she knows when I get hooked on something there is nothing she can do. I just have to make sure I clean everything out before buying the next locker and we are good.

You can't have a true reference point until you start going to auctions to at least see what is in the lockers. At least from my limited experience (just over 10 auctions in a few months) I think you will be shocked at just how much stuiff (re: junk) is in the average locker. Even the smaller units would be tough to move in a car of any type, and almost everything has some sort of piece of furniture in it.

Do you have friends with a pickup that you can borrow when needed? That would work, you don't need to go out and get a box truck, just a way to move stuff out of the facility quickly.

Good luck, I have had some fun and done well with the one unit I have purchased, but it is a ton of work.