JJMKulman

Sounds like it will be fine. My interview is Tuesday and we do not have a lease at the moment either, I think our health insurance, life insurance, cell phone, car insurance and trips taken together etc are strong enough. Yours seems the same (even better). I would not worry

No issues that I see........It's good that you found a way to productively spend your time during the wait.

It clearly states on it that they are checking for a volunteer role. I can't imagine it would be an issue. (Although I can't confirm from experience). We live in the state of PA which has the strictest child safety laws in the country. In order for my husband to volunteer, he had to have 3 different types of background checks done, including fingerprints by the FBI. He came back clear, of course. We're still waiting for AOS but don't expect an issue, because the reason these checks were done was clearly marked as volunteer and it was requested by a non-profit. 

~~Moved to AOS Family K1/K3 from K1 P&P - The OP is past the K1 visa an now on to the AOS stage.~~

Assemble your package using clips.  Any extra office supplies you include will simply be thrown away 
 
Secondly. you should be visiting,  reading and posting these questions in the AOS forum 

A little bit is usually good. We just showed joint lease and joint savings account in our packet. Didn't bother with photos or anything.

Pictures are of little value.   If you have other evidence of commingled life you certainly can include it

Volunteering for truly volunteer positions is fine. I volunteered with a non-profit that provides pro-bono legal services to detainees in immigration detention. I scanned and also did translations. Both of these volunteer opportunities were advertised on their website. I would stay away from unpaid internships, and from doing "volunteer" work for which they would normally pay a person.

*~*~*moved from “K-1 visa process and procedures” to “working and traveling”*~*~*

It has to be a position doing work that no one would ever expect to be paid for. 
 
The example of the translation work for refugees is a perfect definition of the type of thing that is permitted. Helping in a soup kitchen or animal shelter are also good examples. People don’t do these things to further their career and there is no expectation that it will lead to paid work later down the line. It is done purely altruistically. 
 
Offering to make the coffee and open the mail at your friend’s workplace would not be permitted. Even very junior roles in offices and other workplaces carry an expectation of payment and the chance for career development by those who undertake them. 
 
In short, helping those who need help is permitted. Getting your “foot in the door” in the hopes of helping yourself is not permitted. 

I believe the rule of thumb is, is if the volunteer work or internship could lead to a paid job or has any gifts given such as gift cards, flowers, anything, it is considered taking a role away from a citizen.

Internships can be a slippery slope, because ideally you intern for something you want and a lot of companies may look to hire the interns they bring in unpaid, which means an unpaid internship could be seen as taking a potential job away from a citizen.

Basically, anything you volunteer for, you have to gain nothing from it other than the experience. So working at a soup kitchen feeding the homeless is okay, as long as you don't accept any gifts as payment or even "appreciation" of your work. But taking an unpaid internship... there is gain in that because it can lead to a job where you are interning at.

Others have done it though, I wouldn't recommend it nor would I do it.